Untabify C files. Will watch buildbots.

1 files changed, 3042 insertions, 3042 deletions

diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index 633d0a7..79385be 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -2,7 +2,7 @@
 #include "Python.h"
 #include "structmember.h"
 
-/* Itertools module written and maintained 
+/* Itertools module written and maintained
    by Raymond D. Hettinger <python@rcn.com>
    Copyright (c) 2003 Python Software Foundation.
    All rights reserved.
@@ -12,12 +12,12 @@
 /* groupby object ***********************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *it;
-	PyObject *keyfunc;
-	PyObject *tgtkey;
-	PyObject *currkey;
-	PyObject *currvalue;
+    PyObject_HEAD
+    PyObject *it;
+    PyObject *keyfunc;
+    PyObject *tgtkey;
+    PyObject *currkey;
+    PyObject *currvalue;
 } groupbyobject;
 
 static PyTypeObject groupby_type;
@@ -26,112 +26,112 @@ static PyObject *_grouper_create(groupbyobject *, PyObject *);
 static PyObject *
 groupby_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	static char *kwargs[] = {"iterable", "key", NULL};
-	groupbyobject *gbo;
- 	PyObject *it, *keyfunc = Py_None;
- 
- 	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:groupby", kwargs,
-					 &it, &keyfunc))
-		return NULL;
-
-	gbo = (groupbyobject *)type->tp_alloc(type, 0);
-	if (gbo == NULL)
-		return NULL;
-	gbo->tgtkey = NULL;
-	gbo->currkey = NULL;
-	gbo->currvalue = NULL;
-	gbo->keyfunc = keyfunc;
-	Py_INCREF(keyfunc);
-	gbo->it = PyObject_GetIter(it);
-	if (gbo->it == NULL) {
-		Py_DECREF(gbo);
-		return NULL;
-	}
-	return (PyObject *)gbo;
+    static char *kwargs[] = {"iterable", "key", NULL};
+    groupbyobject *gbo;
+    PyObject *it, *keyfunc = Py_None;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:groupby", kwargs,
+                                     &it, &keyfunc))
+        return NULL;
+
+    gbo = (groupbyobject *)type->tp_alloc(type, 0);
+    if (gbo == NULL)
+        return NULL;
+    gbo->tgtkey = NULL;
+    gbo->currkey = NULL;
+    gbo->currvalue = NULL;
+    gbo->keyfunc = keyfunc;
+    Py_INCREF(keyfunc);
+    gbo->it = PyObject_GetIter(it);
+    if (gbo->it == NULL) {
+        Py_DECREF(gbo);
+        return NULL;
+    }
+    return (PyObject *)gbo;
 }
 
 static void
 groupby_dealloc(groupbyobject *gbo)
 {
-	PyObject_GC_UnTrack(gbo);
-	Py_XDECREF(gbo->it);
-	Py_XDECREF(gbo->keyfunc);
-	Py_XDECREF(gbo->tgtkey);
-	Py_XDECREF(gbo->currkey);
-	Py_XDECREF(gbo->currvalue);
-	Py_TYPE(gbo)->tp_free(gbo);
+    PyObject_GC_UnTrack(gbo);
+    Py_XDECREF(gbo->it);
+    Py_XDECREF(gbo->keyfunc);
+    Py_XDECREF(gbo->tgtkey);
+    Py_XDECREF(gbo->currkey);
+    Py_XDECREF(gbo->currvalue);
+    Py_TYPE(gbo)->tp_free(gbo);
 }
 
 static int
 groupby_traverse(groupbyobject *gbo, visitproc visit, void *arg)
 {
-	Py_VISIT(gbo->it);
-	Py_VISIT(gbo->keyfunc);
-	Py_VISIT(gbo->tgtkey);
-	Py_VISIT(gbo->currkey);
-	Py_VISIT(gbo->currvalue);
-	return 0;
+    Py_VISIT(gbo->it);
+    Py_VISIT(gbo->keyfunc);
+    Py_VISIT(gbo->tgtkey);
+    Py_VISIT(gbo->currkey);
+    Py_VISIT(gbo->currvalue);
+    return 0;
 }
 
 static PyObject *
 groupby_next(groupbyobject *gbo)
 {
-	PyObject *newvalue, *newkey, *r, *grouper, *tmp;
-
-	/* skip to next iteration group */
-	for (;;) {
-		if (gbo->currkey == NULL)
-			/* pass */;
-		else if (gbo->tgtkey == NULL)
-			break;
-		else {
-			int rcmp;
-
-			rcmp = PyObject_RichCompareBool(gbo->tgtkey,
-							gbo->currkey, Py_EQ);
-			if (rcmp == -1)
-				return NULL;
-			else if (rcmp == 0)
-				break;
-		}
-
-		newvalue = PyIter_Next(gbo->it);
-		if (newvalue == NULL)
-			return NULL;
-
-		if (gbo->keyfunc == Py_None) {
-			newkey = newvalue;
-			Py_INCREF(newvalue);
-		} else {
-			newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
-							      newvalue, NULL);
-			if (newkey == NULL) {
-				Py_DECREF(newvalue);
-				return NULL;
-			}
-		}
-
-		tmp = gbo->currkey;
-		gbo->currkey = newkey;
-		Py_XDECREF(tmp);
-
-		tmp = gbo->currvalue;
-		gbo->currvalue = newvalue;
-		Py_XDECREF(tmp);
-	}
-
-	Py_INCREF(gbo->currkey);
-	tmp = gbo->tgtkey;
-	gbo->tgtkey = gbo->currkey;
-	Py_XDECREF(tmp);
-
-	grouper = _grouper_create(gbo, gbo->tgtkey);
-	if (grouper == NULL)
-		return NULL;
-
-	r = PyTuple_Pack(2, gbo->currkey, grouper);
-	Py_DECREF(grouper);
-	return r;
+    PyObject *newvalue, *newkey, *r, *grouper, *tmp;
+
+    /* skip to next iteration group */
+    for (;;) {
+        if (gbo->currkey == NULL)
+            /* pass */;
+        else if (gbo->tgtkey == NULL)
+            break;
+        else {
+            int rcmp;
+
+            rcmp = PyObject_RichCompareBool(gbo->tgtkey,
+                                            gbo->currkey, Py_EQ);
+            if (rcmp == -1)
+                return NULL;
+            else if (rcmp == 0)
+                break;
+        }
+
+        newvalue = PyIter_Next(gbo->it);
+        if (newvalue == NULL)
+            return NULL;
+
+        if (gbo->keyfunc == Py_None) {
+            newkey = newvalue;
+            Py_INCREF(newvalue);
+        } else {
+            newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
+                                                  newvalue, NULL);
+            if (newkey == NULL) {
+                Py_DECREF(newvalue);
+                return NULL;
+            }
+        }
+
+        tmp = gbo->currkey;
+        gbo->currkey = newkey;
+        Py_XDECREF(tmp);
+
+        tmp = gbo->currvalue;
+        gbo->currvalue = newvalue;
+        Py_XDECREF(tmp);
+    }
+
+    Py_INCREF(gbo->currkey);
+    tmp = gbo->tgtkey;
+    gbo->tgtkey = gbo->currkey;
+    Py_XDECREF(tmp);
+
+    grouper = _grouper_create(gbo, gbo->tgtkey);
+    if (grouper == NULL)
+        return NULL;
+
+    r = PyTuple_Pack(2, gbo->currkey, grouper);
+    Py_DECREF(grouper);
+    return r;
 }
 
 PyDoc_STRVAR(groupby_doc,
@@ -139,56 +139,56 @@ PyDoc_STRVAR(groupby_doc,
 (key, sub-iterator) grouped by each value of key(value).\n");
 
 static PyTypeObject groupby_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.groupby",		/* tp_name */
-	sizeof(groupbyobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)groupby_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	groupby_doc,			/* tp_doc */
-	(traverseproc)groupby_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)groupby_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	groupby_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.groupby",                /* tp_name */
+    sizeof(groupbyobject),              /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)groupby_dealloc,        /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    groupby_doc,                        /* tp_doc */
+    (traverseproc)groupby_traverse,     /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)groupby_next,         /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    groupby_new,                        /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* _grouper object (internal) ************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *parent;
-	PyObject *tgtkey;
+    PyObject_HEAD
+    PyObject *parent;
+    PyObject *tgtkey;
 } _grouperobject;
 
 static PyTypeObject _grouper_type;
@@ -196,129 +196,129 @@ static PyTypeObject _grouper_type;
 static PyObject *
 _grouper_create(groupbyobject *parent, PyObject *tgtkey)
 {
-	_grouperobject *igo;
-
-	igo = PyObject_GC_New(_grouperobject, &_grouper_type);
-	if (igo == NULL)
-		return NULL;
-	igo->parent = (PyObject *)parent;
-	Py_INCREF(parent);
-	igo->tgtkey = tgtkey;
-	Py_INCREF(tgtkey);
-
-	PyObject_GC_Track(igo);
-	return (PyObject *)igo;
+    _grouperobject *igo;
+
+    igo = PyObject_GC_New(_grouperobject, &_grouper_type);
+    if (igo == NULL)
+        return NULL;
+    igo->parent = (PyObject *)parent;
+    Py_INCREF(parent);
+    igo->tgtkey = tgtkey;
+    Py_INCREF(tgtkey);
+
+    PyObject_GC_Track(igo);
+    return (PyObject *)igo;
 }
 
 static void
 _grouper_dealloc(_grouperobject *igo)
 {
-	PyObject_GC_UnTrack(igo);
-	Py_DECREF(igo->parent);
-	Py_DECREF(igo->tgtkey);
-	PyObject_GC_Del(igo);
+    PyObject_GC_UnTrack(igo);
+    Py_DECREF(igo->parent);
+    Py_DECREF(igo->tgtkey);
+    PyObject_GC_Del(igo);
 }
 
 static int
 _grouper_traverse(_grouperobject *igo, visitproc visit, void *arg)
 {
-	Py_VISIT(igo->parent);
-	Py_VISIT(igo->tgtkey);
-	return 0;
+    Py_VISIT(igo->parent);
+    Py_VISIT(igo->tgtkey);
+    return 0;
 }
 
 static PyObject *
 _grouper_next(_grouperobject *igo)
 {
-	groupbyobject *gbo = (groupbyobject *)igo->parent;
-	PyObject *newvalue, *newkey, *r;
-	int rcmp;
-
-	if (gbo->currvalue == NULL) {
-		newvalue = PyIter_Next(gbo->it);
-		if (newvalue == NULL)
-			return NULL;
-
-		if (gbo->keyfunc == Py_None) {
-			newkey = newvalue;
-			Py_INCREF(newvalue);
-		} else {
-			newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
-							      newvalue, NULL);
-			if (newkey == NULL) {
-				Py_DECREF(newvalue);
-				return NULL;
-			}
-		}
-
-		assert(gbo->currkey == NULL);
-		gbo->currkey = newkey;
-		gbo->currvalue = newvalue;
-	}
-
-	assert(gbo->currkey != NULL);
-	rcmp = PyObject_RichCompareBool(igo->tgtkey, gbo->currkey, Py_EQ);
-	if (rcmp <= 0)
-		/* got any error or current group is end */
-		return NULL;
-
-	r = gbo->currvalue;
-	gbo->currvalue = NULL;
-	Py_CLEAR(gbo->currkey);
-
-	return r;
+    groupbyobject *gbo = (groupbyobject *)igo->parent;
+    PyObject *newvalue, *newkey, *r;
+    int rcmp;
+
+    if (gbo->currvalue == NULL) {
+        newvalue = PyIter_Next(gbo->it);
+        if (newvalue == NULL)
+            return NULL;
+
+        if (gbo->keyfunc == Py_None) {
+            newkey = newvalue;
+            Py_INCREF(newvalue);
+        } else {
+            newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
+                                                  newvalue, NULL);
+            if (newkey == NULL) {
+                Py_DECREF(newvalue);
+                return NULL;
+            }
+        }
+
+        assert(gbo->currkey == NULL);
+        gbo->currkey = newkey;
+        gbo->currvalue = newvalue;
+    }
+
+    assert(gbo->currkey != NULL);
+    rcmp = PyObject_RichCompareBool(igo->tgtkey, gbo->currkey, Py_EQ);
+    if (rcmp <= 0)
+        /* got any error or current group is end */
+        return NULL;
+
+    r = gbo->currvalue;
+    gbo->currvalue = NULL;
+    Py_CLEAR(gbo->currkey);
+
+    return r;
 }
 
 static PyTypeObject _grouper_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools._grouper",		/* tp_name */
-	sizeof(_grouperobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)_grouper_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,	/* tp_flags */
-	0,				/* tp_doc */
-	(traverseproc)_grouper_traverse,/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)_grouper_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	0,				/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools._grouper",               /* tp_name */
+    sizeof(_grouperobject),             /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)_grouper_dealloc,       /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,            /* tp_flags */
+    0,                                  /* tp_doc */
+    (traverseproc)_grouper_traverse,/* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)_grouper_next,        /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    0,                                  /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
- 
+
 
 /* tee object and with supporting function and objects ***************/
 
 /* The teedataobject pre-allocates space for LINKCELLS number of objects.
    To help the object fit neatly inside cache lines (space for 16 to 32
-   pointers), the value should be a multiple of 16 minus  space for 
+   pointers), the value should be a multiple of 16 minus  space for
    the other structure members including PyHEAD overhead.  The larger the
    value, the less memory overhead per object and the less time spent
    allocating/deallocating new links.  The smaller the number, the less
@@ -327,18 +327,18 @@ static PyTypeObject _grouper_type = {
 #define LINKCELLS 57
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *it;
-	int numread;
-	PyObject *nextlink;
-	PyObject *(values[LINKCELLS]);
+    PyObject_HEAD
+    PyObject *it;
+    int numread;
+    PyObject *nextlink;
+    PyObject *(values[LINKCELLS]);
 } teedataobject;
 
 typedef struct {
-	PyObject_HEAD
-	teedataobject *dataobj;
-	int index;
-	PyObject *weakreflist;
+    PyObject_HEAD
+    teedataobject *dataobj;
+    int index;
+    PyObject *weakreflist;
 } teeobject;
 
 static PyTypeObject teedataobject_type;
@@ -346,123 +346,123 @@ static PyTypeObject teedataobject_type;
 static PyObject *
 teedataobject_new(PyObject *it)
 {
-	teedataobject *tdo;
-
-	tdo = PyObject_GC_New(teedataobject, &teedataobject_type);
-	if (tdo == NULL)
-		return NULL;
-
-	tdo->numread = 0;
-	tdo->nextlink = NULL;
-	Py_INCREF(it);
-	tdo->it = it;
-	PyObject_GC_Track(tdo);
-	return (PyObject *)tdo;
+    teedataobject *tdo;
+
+    tdo = PyObject_GC_New(teedataobject, &teedataobject_type);
+    if (tdo == NULL)
+        return NULL;
+
+    tdo->numread = 0;
+    tdo->nextlink = NULL;
+    Py_INCREF(it);
+    tdo->it = it;
+    PyObject_GC_Track(tdo);
+    return (PyObject *)tdo;
 }
 
 static PyObject *
 teedataobject_jumplink(teedataobject *tdo)
 {
-	if (tdo->nextlink == NULL)
-		tdo->nextlink = teedataobject_new(tdo->it);
-	Py_XINCREF(tdo->nextlink);
-	return tdo->nextlink;
+    if (tdo->nextlink == NULL)
+        tdo->nextlink = teedataobject_new(tdo->it);
+    Py_XINCREF(tdo->nextlink);
+    return tdo->nextlink;
 }
 
 static PyObject *
 teedataobject_getitem(teedataobject *tdo, int i)
 {
-	PyObject *value;
-
-	assert(i < LINKCELLS);
-	if (i < tdo->numread)
-		value = tdo->values[i];
-	else {
-		/* this is the lead iterator, so fetch more data */
-		assert(i == tdo->numread);
-		value = PyIter_Next(tdo->it);
-		if (value == NULL)
-			return NULL;
-		tdo->numread++;
-		tdo->values[i] = value;
-	}
-	Py_INCREF(value);
-	return value;
+    PyObject *value;
+
+    assert(i < LINKCELLS);
+    if (i < tdo->numread)
+        value = tdo->values[i];
+    else {
+        /* this is the lead iterator, so fetch more data */
+        assert(i == tdo->numread);
+        value = PyIter_Next(tdo->it);
+        if (value == NULL)
+            return NULL;
+        tdo->numread++;
+        tdo->values[i] = value;
+    }
+    Py_INCREF(value);
+    return value;
 }
 
 static int
 teedataobject_traverse(teedataobject *tdo, visitproc visit, void * arg)
 {
-	int i;
-	Py_VISIT(tdo->it);
-	for (i = 0; i < tdo->numread; i++)
-		Py_VISIT(tdo->values[i]);
-	Py_VISIT(tdo->nextlink);
-	return 0;
+    int i;
+    Py_VISIT(tdo->it);
+    for (i = 0; i < tdo->numread; i++)
+        Py_VISIT(tdo->values[i]);
+    Py_VISIT(tdo->nextlink);
+    return 0;
 }
 
 static int
 teedataobject_clear(teedataobject *tdo)
 {
-	int i;
-	Py_CLEAR(tdo->it);
-	for (i=0 ; i<tdo->numread ; i++)
-		Py_CLEAR(tdo->values[i]);
-	Py_CLEAR(tdo->nextlink);
-	return 0;
+    int i;
+    Py_CLEAR(tdo->it);
+    for (i=0 ; i<tdo->numread ; i++)
+        Py_CLEAR(tdo->values[i]);
+    Py_CLEAR(tdo->nextlink);
+    return 0;
 }
 
 static void
 teedataobject_dealloc(teedataobject *tdo)
 {
-	PyObject_GC_UnTrack(tdo);
-	teedataobject_clear(tdo);
-	PyObject_GC_Del(tdo);
+    PyObject_GC_UnTrack(tdo);
+    teedataobject_clear(tdo);
+    PyObject_GC_Del(tdo);
 }
 
 PyDoc_STRVAR(teedataobject_doc, "Data container common to multiple tee objects.");
 
 static PyTypeObject teedataobject_type = {
-	PyVarObject_HEAD_INIT(0, 0)	/* Must fill in type value later */
-	"itertools.tee_dataobject",		/* tp_name */
-	sizeof(teedataobject),			/* tp_basicsize */
-	0,					/* tp_itemsize */
-	/* methods */
-	(destructor)teedataobject_dealloc,	/* tp_dealloc */
-	0,					/* tp_print */
-	0,					/* tp_getattr */
-	0,					/* tp_setattr */
-	0,					/* tp_compare */
-	0,					/* tp_repr */
-	0,					/* tp_as_number */
-	0,					/* tp_as_sequence */
-	0,					/* tp_as_mapping */
-	0,					/* tp_hash */
-	0,					/* tp_call */
-	0,					/* tp_str */
-	PyObject_GenericGetAttr,		/* tp_getattro */
-	0,					/* tp_setattro */
-	0,					/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,	/* tp_flags */
-	teedataobject_doc,			/* tp_doc */
-	(traverseproc)teedataobject_traverse,	/* tp_traverse */
-	(inquiry)teedataobject_clear,		/* tp_clear */
-	0,					/* tp_richcompare */
-	0,					/* tp_weaklistoffset */
-	0,					/* tp_iter */
-	0,					/* tp_iternext */
-	0,					/* tp_methods */
-	0,					/* tp_members */
-	0,					/* tp_getset */
-	0,					/* tp_base */
-	0,					/* tp_dict */
-	0,					/* tp_descr_get */
-	0,					/* tp_descr_set */
-	0,					/* tp_dictoffset */
-	0,					/* tp_init */
-	0,					/* tp_alloc */
-	0,					/* tp_new */
-	PyObject_GC_Del,			/* tp_free */
+    PyVarObject_HEAD_INIT(0, 0)         /* Must fill in type value later */
+    "itertools.tee_dataobject",                 /* tp_name */
+    sizeof(teedataobject),                      /* tp_basicsize */
+    0,                                          /* tp_itemsize */
+    /* methods */
+    (destructor)teedataobject_dealloc,          /* tp_dealloc */
+    0,                                          /* tp_print */
+    0,                                          /* tp_getattr */
+    0,                                          /* tp_setattr */
+    0,                                          /* tp_compare */
+    0,                                          /* tp_repr */
+    0,                                          /* tp_as_number */
+    0,                                          /* tp_as_sequence */
+    0,                                          /* tp_as_mapping */
+    0,                                          /* tp_hash */
+    0,                                          /* tp_call */
+    0,                                          /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                          /* tp_setattro */
+    0,                                          /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,            /* tp_flags */
+    teedataobject_doc,                          /* tp_doc */
+    (traverseproc)teedataobject_traverse,       /* tp_traverse */
+    (inquiry)teedataobject_clear,               /* tp_clear */
+    0,                                          /* tp_richcompare */
+    0,                                          /* tp_weaklistoffset */
+    0,                                          /* tp_iter */
+    0,                                          /* tp_iternext */
+    0,                                          /* tp_methods */
+    0,                                          /* tp_members */
+    0,                                          /* tp_getset */
+    0,                                          /* tp_base */
+    0,                                          /* tp_dict */
+    0,                                          /* tp_descr_get */
+    0,                                          /* tp_descr_set */
+    0,                                          /* tp_dictoffset */
+    0,                                          /* tp_init */
+    0,                                          /* tp_alloc */
+    0,                                          /* tp_new */
+    PyObject_GC_Del,                            /* tp_free */
 };
 
 
@@ -471,42 +471,42 @@ static PyTypeObject tee_type;
 static PyObject *
 tee_next(teeobject *to)
 {
-	PyObject *value, *link;
-
-	if (to->index >= LINKCELLS) {
-		link = teedataobject_jumplink(to->dataobj);
-		Py_DECREF(to->dataobj);
-		to->dataobj = (teedataobject *)link;
-		to->index = 0;
-	}
-	value = teedataobject_getitem(to->dataobj, to->index);
-	if (value == NULL)
-		return NULL;
-	to->index++;
-	return value;
+    PyObject *value, *link;
+
+    if (to->index >= LINKCELLS) {
+        link = teedataobject_jumplink(to->dataobj);
+        Py_DECREF(to->dataobj);
+        to->dataobj = (teedataobject *)link;
+        to->index = 0;
+    }
+    value = teedataobject_getitem(to->dataobj, to->index);
+    if (value == NULL)
+        return NULL;
+    to->index++;
+    return value;
 }
 
 static int
 tee_traverse(teeobject *to, visitproc visit, void *arg)
 {
-	Py_VISIT((PyObject *)to->dataobj);
-	return 0;
+    Py_VISIT((PyObject *)to->dataobj);
+    return 0;
 }
 
 static PyObject *
 tee_copy(teeobject *to)
 {
-	teeobject *newto;
-
-	newto = PyObject_GC_New(teeobject, &tee_type);
-	if (newto == NULL)
-		return NULL;
-	Py_INCREF(to->dataobj);
-	newto->dataobj = to->dataobj;
-	newto->index = to->index;
-	newto->weakreflist = NULL;
-	PyObject_GC_Track(newto);
-	return (PyObject *)newto;
+    teeobject *newto;
+
+    newto = PyObject_GC_New(teeobject, &tee_type);
+    if (newto == NULL)
+        return NULL;
+    Py_INCREF(to->dataobj);
+    newto->dataobj = to->dataobj;
+    newto->index = to->index;
+    newto->weakreflist = NULL;
+    PyObject_GC_Track(newto);
+    return (PyObject *)newto;
 }
 
 PyDoc_STRVAR(teecopy_doc, "Returns an independent iterator.");
@@ -514,154 +514,154 @@ PyDoc_STRVAR(teecopy_doc, "Returns an independent iterator.");
 static PyObject *
 tee_fromiterable(PyObject *iterable)
 {
-	teeobject *to;
-	PyObject *it = NULL;
-
-	it = PyObject_GetIter(iterable);
-	if (it == NULL)
-		return NULL;
-	if (PyObject_TypeCheck(it, &tee_type)) {
-		to = (teeobject *)tee_copy((teeobject *)it);
-		goto done;
-	}
-
-	to = PyObject_GC_New(teeobject, &tee_type);
-	if (to == NULL) 
-		goto done;
-	to->dataobj = (teedataobject *)teedataobject_new(it);
-	if (!to->dataobj) {
-		PyObject_GC_Del(to);
-		to = NULL;
-		goto done;
-	}
-
-	to->index = 0;
-	to->weakreflist = NULL;
-	PyObject_GC_Track(to);
+    teeobject *to;
+    PyObject *it = NULL;
+
+    it = PyObject_GetIter(iterable);
+    if (it == NULL)
+        return NULL;
+    if (PyObject_TypeCheck(it, &tee_type)) {
+        to = (teeobject *)tee_copy((teeobject *)it);
+        goto done;
+    }
+
+    to = PyObject_GC_New(teeobject, &tee_type);
+    if (to == NULL)
+        goto done;
+    to->dataobj = (teedataobject *)teedataobject_new(it);
+    if (!to->dataobj) {
+        PyObject_GC_Del(to);
+        to = NULL;
+        goto done;
+    }
+
+    to->index = 0;
+    to->weakreflist = NULL;
+    PyObject_GC_Track(to);
 done:
-	Py_XDECREF(it);
-	return (PyObject *)to;
+    Py_XDECREF(it);
+    return (PyObject *)to;
 }
 
 static PyObject *
 tee_new(PyTypeObject *type, PyObject *args, PyObject *kw)
 {
-	PyObject *iterable;
+    PyObject *iterable;
 
-	if (!PyArg_UnpackTuple(args, "tee", 1, 1, &iterable))
-		return NULL;
-	return tee_fromiterable(iterable);
+    if (!PyArg_UnpackTuple(args, "tee", 1, 1, &iterable))
+        return NULL;
+    return tee_fromiterable(iterable);
 }
 
 static int
 tee_clear(teeobject *to)
 {
-	if (to->weakreflist != NULL)
-		PyObject_ClearWeakRefs((PyObject *) to);
-	Py_CLEAR(to->dataobj);
-	return 0;
+    if (to->weakreflist != NULL)
+        PyObject_ClearWeakRefs((PyObject *) to);
+    Py_CLEAR(to->dataobj);
+    return 0;
 }
 
 static void
 tee_dealloc(teeobject *to)
 {
-	PyObject_GC_UnTrack(to);
-	tee_clear(to);
-	PyObject_GC_Del(to);
+    PyObject_GC_UnTrack(to);
+    tee_clear(to);
+    PyObject_GC_Del(to);
 }
 
 PyDoc_STRVAR(teeobject_doc,
 "Iterator wrapped to make it copyable");
 
 static PyMethodDef tee_methods[] = {
-	{"__copy__",	(PyCFunction)tee_copy,	METH_NOARGS, teecopy_doc},
- 	{NULL,		NULL}		/* sentinel */
+    {"__copy__",        (PyCFunction)tee_copy,  METH_NOARGS, teecopy_doc},
+    {NULL,              NULL}           /* sentinel */
 };
 
 static PyTypeObject tee_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.tee",		/* tp_name */
-	sizeof(teeobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)tee_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	0,				/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,	/* tp_flags */
-	teeobject_doc,			/* tp_doc */
-	(traverseproc)tee_traverse,	/* tp_traverse */
-	(inquiry)tee_clear,		/* tp_clear */
-	0,				/* tp_richcompare */
-	offsetof(teeobject, weakreflist),	/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)tee_next,		/* tp_iternext */
-	tee_methods,			/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	tee_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.tee",                    /* tp_name */
+    sizeof(teeobject),                  /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)tee_dealloc,            /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    0,                                  /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,            /* tp_flags */
+    teeobject_doc,                      /* tp_doc */
+    (traverseproc)tee_traverse,         /* tp_traverse */
+    (inquiry)tee_clear,                 /* tp_clear */
+    0,                                  /* tp_richcompare */
+    offsetof(teeobject, weakreflist),           /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)tee_next,             /* tp_iternext */
+    tee_methods,                        /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    tee_new,                            /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 static PyObject *
 tee(PyObject *self, PyObject *args)
 {
-	Py_ssize_t i, n=2;
-	PyObject *it, *iterable, *copyable, *result;
-
-	if (!PyArg_ParseTuple(args, "O|n", &iterable, &n))
-		return NULL;
-	if (n < 0) {
-		PyErr_SetString(PyExc_ValueError, "n must be >= 0");
-		return NULL;
-	}
-	result = PyTuple_New(n);
-	if (result == NULL)
-		return NULL;
-	if (n == 0)
-		return result;
-	it = PyObject_GetIter(iterable);
-	if (it == NULL) {
-		Py_DECREF(result);
-		return NULL;
-	}
-	if (!PyObject_HasAttrString(it, "__copy__")) {
-		copyable = tee_fromiterable(it);
-		Py_DECREF(it);
-		if (copyable == NULL) {
-			Py_DECREF(result);
-			return NULL;
-		}
-	} else
-		copyable = it;
-	PyTuple_SET_ITEM(result, 0, copyable);
-	for (i=1 ; i<n ; i++) {
-		copyable = PyObject_CallMethod(copyable, "__copy__", NULL);
-		if (copyable == NULL) {
-			Py_DECREF(result);
-			return NULL;
-		}
-		PyTuple_SET_ITEM(result, i, copyable);
-	}
-	return result;
+    Py_ssize_t i, n=2;
+    PyObject *it, *iterable, *copyable, *result;
+
+    if (!PyArg_ParseTuple(args, "O|n", &iterable, &n))
+        return NULL;
+    if (n < 0) {
+        PyErr_SetString(PyExc_ValueError, "n must be >= 0");
+        return NULL;
+    }
+    result = PyTuple_New(n);
+    if (result == NULL)
+        return NULL;
+    if (n == 0)
+        return result;
+    it = PyObject_GetIter(iterable);
+    if (it == NULL) {
+        Py_DECREF(result);
+        return NULL;
+    }
+    if (!PyObject_HasAttrString(it, "__copy__")) {
+        copyable = tee_fromiterable(it);
+        Py_DECREF(it);
+        if (copyable == NULL) {
+            Py_DECREF(result);
+            return NULL;
+        }
+    } else
+        copyable = it;
+    PyTuple_SET_ITEM(result, 0, copyable);
+    for (i=1 ; i<n ; i++) {
+        copyable = PyObject_CallMethod(copyable, "__copy__", NULL);
+        if (copyable == NULL) {
+            Py_DECREF(result);
+            return NULL;
+        }
+        PyTuple_SET_ITEM(result, i, copyable);
+    }
+    return result;
 }
 
 PyDoc_STRVAR(tee_doc,
@@ -671,10 +671,10 @@ PyDoc_STRVAR(tee_doc,
 /* cycle object **********************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *it;
-	PyObject *saved;
-	int firstpass;
+    PyObject_HEAD
+    PyObject *it;
+    PyObject *saved;
+    int firstpass;
 } cycleobject;
 
 static PyTypeObject cycle_type;
@@ -682,91 +682,91 @@ static PyTypeObject cycle_type;
 static PyObject *
 cycle_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *it;
-	PyObject *iterable;
-	PyObject *saved;
-	cycleobject *lz;
-
-	if (type == &cycle_type && !_PyArg_NoKeywords("cycle()", kwds))
-		return NULL;
-
-	if (!PyArg_UnpackTuple(args, "cycle", 1, 1, &iterable))
-		return NULL;
-
-	/* Get iterator. */
-	it = PyObject_GetIter(iterable);
-	if (it == NULL)
-		return NULL;
-
-	saved = PyList_New(0);
-	if (saved == NULL) {
-		Py_DECREF(it);
-		return NULL;
-	}
-
-	/* create cycleobject structure */
-	lz = (cycleobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(it);
-		Py_DECREF(saved);
-		return NULL;
-	}
-	lz->it = it;
-	lz->saved = saved;
-	lz->firstpass = 0;
-
-	return (PyObject *)lz;
+    PyObject *it;
+    PyObject *iterable;
+    PyObject *saved;
+    cycleobject *lz;
+
+    if (type == &cycle_type && !_PyArg_NoKeywords("cycle()", kwds))
+        return NULL;
+
+    if (!PyArg_UnpackTuple(args, "cycle", 1, 1, &iterable))
+        return NULL;
+
+    /* Get iterator. */
+    it = PyObject_GetIter(iterable);
+    if (it == NULL)
+        return NULL;
+
+    saved = PyList_New(0);
+    if (saved == NULL) {
+        Py_DECREF(it);
+        return NULL;
+    }
+
+    /* create cycleobject structure */
+    lz = (cycleobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(it);
+        Py_DECREF(saved);
+        return NULL;
+    }
+    lz->it = it;
+    lz->saved = saved;
+    lz->firstpass = 0;
+
+    return (PyObject *)lz;
 }
 
 static void
 cycle_dealloc(cycleobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->saved);
-	Py_XDECREF(lz->it);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->saved);
+    Py_XDECREF(lz->it);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 cycle_traverse(cycleobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->it);
-	Py_VISIT(lz->saved);
-	return 0;
+    Py_VISIT(lz->it);
+    Py_VISIT(lz->saved);
+    return 0;
 }
 
 static PyObject *
 cycle_next(cycleobject *lz)
 {
-	PyObject *item;
-	PyObject *it;
-	PyObject *tmp;
-
-	while (1) {
-		item = PyIter_Next(lz->it);
-		if (item != NULL) {
-			if (!lz->firstpass && PyList_Append(lz->saved, item)) {
-				Py_DECREF(item);
-				return NULL;
-			}
-			return item;
-		}
-		if (PyErr_Occurred()) {
-			if (PyErr_ExceptionMatches(PyExc_StopIteration))
-				PyErr_Clear();
-			else
-				return NULL;
-		}
-		if (PyList_Size(lz->saved) == 0) 
-			return NULL;
-		it = PyObject_GetIter(lz->saved);
-		if (it == NULL)
-			return NULL;
-		tmp = lz->it;
-		lz->it = it;
-		lz->firstpass = 1;
-		Py_DECREF(tmp);
-	}
+    PyObject *item;
+    PyObject *it;
+    PyObject *tmp;
+
+    while (1) {
+        item = PyIter_Next(lz->it);
+        if (item != NULL) {
+            if (!lz->firstpass && PyList_Append(lz->saved, item)) {
+                Py_DECREF(item);
+                return NULL;
+            }
+            return item;
+        }
+        if (PyErr_Occurred()) {
+            if (PyErr_ExceptionMatches(PyExc_StopIteration))
+                PyErr_Clear();
+            else
+                return NULL;
+        }
+        if (PyList_Size(lz->saved) == 0)
+            return NULL;
+        it = PyObject_GetIter(lz->saved);
+        if (it == NULL)
+            return NULL;
+        tmp = lz->it;
+        lz->it = it;
+        lz->firstpass = 1;
+        Py_DECREF(tmp);
+    }
 }
 
 PyDoc_STRVAR(cycle_doc,
@@ -776,57 +776,57 @@ Return elements from the iterable until it is exhausted.\n\
 Then repeat the sequence indefinitely.");
 
 static PyTypeObject cycle_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.cycle",		/* tp_name */
-	sizeof(cycleobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)cycle_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	cycle_doc,			/* tp_doc */
-	(traverseproc)cycle_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)cycle_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	cycle_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.cycle",                  /* tp_name */
+    sizeof(cycleobject),                /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)cycle_dealloc,          /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    cycle_doc,                          /* tp_doc */
+    (traverseproc)cycle_traverse,       /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)cycle_next,           /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    cycle_new,                          /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* dropwhile object **********************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *func;
-	PyObject *it;
-	long	 start;
+    PyObject_HEAD
+    PyObject *func;
+    PyObject *it;
+    long         start;
 } dropwhileobject;
 
 static PyTypeObject dropwhile_type;
@@ -834,81 +834,81 @@ static PyTypeObject dropwhile_type;
 static PyObject *
 dropwhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *func, *seq;
-	PyObject *it;
-	dropwhileobject *lz;
-
-	if (type == &dropwhile_type && !_PyArg_NoKeywords("dropwhile()", kwds))
-		return NULL;
-
-	if (!PyArg_UnpackTuple(args, "dropwhile", 2, 2, &func, &seq))
-		return NULL;
-
-	/* Get iterator. */
-	it = PyObject_GetIter(seq);
-	if (it == NULL)
-		return NULL;
-
-	/* create dropwhileobject structure */
-	lz = (dropwhileobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(it);
-		return NULL;
-	}
-	Py_INCREF(func);
-	lz->func = func;
-	lz->it = it;
-	lz->start = 0;
-
-	return (PyObject *)lz;
+    PyObject *func, *seq;
+    PyObject *it;
+    dropwhileobject *lz;
+
+    if (type == &dropwhile_type && !_PyArg_NoKeywords("dropwhile()", kwds))
+        return NULL;
+
+    if (!PyArg_UnpackTuple(args, "dropwhile", 2, 2, &func, &seq))
+        return NULL;
+
+    /* Get iterator. */
+    it = PyObject_GetIter(seq);
+    if (it == NULL)
+        return NULL;
+
+    /* create dropwhileobject structure */
+    lz = (dropwhileobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(it);
+        return NULL;
+    }
+    Py_INCREF(func);
+    lz->func = func;
+    lz->it = it;
+    lz->start = 0;
+
+    return (PyObject *)lz;
 }
 
 static void
 dropwhile_dealloc(dropwhileobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->func);
-	Py_XDECREF(lz->it);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->func);
+    Py_XDECREF(lz->it);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 dropwhile_traverse(dropwhileobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->it);
-	Py_VISIT(lz->func);
-	return 0;
+    Py_VISIT(lz->it);
+    Py_VISIT(lz->func);
+    return 0;
 }
 
 static PyObject *
 dropwhile_next(dropwhileobject *lz)
 {
-	PyObject *item, *good;
-	PyObject *it = lz->it;
-	long ok;
-	PyObject *(*iternext)(PyObject *);
-
-	iternext = *Py_TYPE(it)->tp_iternext;
-	for (;;) {
-		item = iternext(it);
-		if (item == NULL)
-			return NULL;
-		if (lz->start == 1)
-			return item;
-
-		good = PyObject_CallFunctionObjArgs(lz->func, item, NULL);
-		if (good == NULL) {
-			Py_DECREF(item);
-			return NULL;
-		}
-		ok = PyObject_IsTrue(good);
-		Py_DECREF(good);
-		if (!ok) {
-			lz->start = 1;
-			return item;
-		}
-		Py_DECREF(item);
-	}
+    PyObject *item, *good;
+    PyObject *it = lz->it;
+    long ok;
+    PyObject *(*iternext)(PyObject *);
+
+    iternext = *Py_TYPE(it)->tp_iternext;
+    for (;;) {
+        item = iternext(it);
+        if (item == NULL)
+            return NULL;
+        if (lz->start == 1)
+            return item;
+
+        good = PyObject_CallFunctionObjArgs(lz->func, item, NULL);
+        if (good == NULL) {
+            Py_DECREF(item);
+            return NULL;
+        }
+        ok = PyObject_IsTrue(good);
+        Py_DECREF(good);
+        if (!ok) {
+            lz->start = 1;
+            return item;
+        }
+        Py_DECREF(item);
+    }
 }
 
 PyDoc_STRVAR(dropwhile_doc,
@@ -918,57 +918,57 @@ Drop items from the iterable while predicate(item) is true.\n\
 Afterwards, return every element until the iterable is exhausted.");
 
 static PyTypeObject dropwhile_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.dropwhile",		/* tp_name */
-	sizeof(dropwhileobject),	/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)dropwhile_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	dropwhile_doc,			/* tp_doc */
-	(traverseproc)dropwhile_traverse,    /* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)dropwhile_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	dropwhile_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.dropwhile",              /* tp_name */
+    sizeof(dropwhileobject),            /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)dropwhile_dealloc,      /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    dropwhile_doc,                      /* tp_doc */
+    (traverseproc)dropwhile_traverse,    /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)dropwhile_next,       /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    dropwhile_new,                      /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* takewhile object **********************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *func;
-	PyObject *it;
-	long	 stop;
+    PyObject_HEAD
+    PyObject *func;
+    PyObject *it;
+    long         stop;
 } takewhileobject;
 
 static PyTypeObject takewhile_type;
@@ -976,78 +976,78 @@ static PyTypeObject takewhile_type;
 static PyObject *
 takewhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *func, *seq;
-	PyObject *it;
-	takewhileobject *lz;
-
-	if (type == &takewhile_type && !_PyArg_NoKeywords("takewhile()", kwds))
-		return NULL;
-
-	if (!PyArg_UnpackTuple(args, "takewhile", 2, 2, &func, &seq))
-		return NULL;
-
-	/* Get iterator. */
-	it = PyObject_GetIter(seq);
-	if (it == NULL)
-		return NULL;
-
-	/* create takewhileobject structure */
-	lz = (takewhileobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(it);
-		return NULL;
-	}
-	Py_INCREF(func);
-	lz->func = func;
-	lz->it = it;
-	lz->stop = 0;
-
-	return (PyObject *)lz;
+    PyObject *func, *seq;
+    PyObject *it;
+    takewhileobject *lz;
+
+    if (type == &takewhile_type && !_PyArg_NoKeywords("takewhile()", kwds))
+        return NULL;
+
+    if (!PyArg_UnpackTuple(args, "takewhile", 2, 2, &func, &seq))
+        return NULL;
+
+    /* Get iterator. */
+    it = PyObject_GetIter(seq);
+    if (it == NULL)
+        return NULL;
+
+    /* create takewhileobject structure */
+    lz = (takewhileobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(it);
+        return NULL;
+    }
+    Py_INCREF(func);
+    lz->func = func;
+    lz->it = it;
+    lz->stop = 0;
+
+    return (PyObject *)lz;
 }
 
 static void
 takewhile_dealloc(takewhileobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->func);
-	Py_XDECREF(lz->it);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->func);
+    Py_XDECREF(lz->it);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 takewhile_traverse(takewhileobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->it);
-	Py_VISIT(lz->func);
-	return 0;
+    Py_VISIT(lz->it);
+    Py_VISIT(lz->func);
+    return 0;
 }
 
 static PyObject *
 takewhile_next(takewhileobject *lz)
 {
-	PyObject *item, *good;
-	PyObject *it = lz->it;
-	long ok;
-
-	if (lz->stop == 1)
-		return NULL;
-
-	item = (*Py_TYPE(it)->tp_iternext)(it);
-	if (item == NULL)
-		return NULL;
-
-	good = PyObject_CallFunctionObjArgs(lz->func, item, NULL);
-	if (good == NULL) {
-		Py_DECREF(item);
-		return NULL;
-	}
-	ok = PyObject_IsTrue(good);
-	Py_DECREF(good);
-	if (ok)
-		return item;
-	Py_DECREF(item);
-	lz->stop = 1;
-	return NULL;
+    PyObject *item, *good;
+    PyObject *it = lz->it;
+    long ok;
+
+    if (lz->stop == 1)
+        return NULL;
+
+    item = (*Py_TYPE(it)->tp_iternext)(it);
+    if (item == NULL)
+        return NULL;
+
+    good = PyObject_CallFunctionObjArgs(lz->func, item, NULL);
+    if (good == NULL) {
+        Py_DECREF(item);
+        return NULL;
+    }
+    ok = PyObject_IsTrue(good);
+    Py_DECREF(good);
+    if (ok)
+        return item;
+    Py_DECREF(item);
+    lz->stop = 1;
+    return NULL;
 }
 
 PyDoc_STRVAR(takewhile_doc,
@@ -1057,59 +1057,59 @@ Return successive entries from an iterable as long as the \n\
 predicate evaluates to true for each entry.");
 
 static PyTypeObject takewhile_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.takewhile",		/* tp_name */
-	sizeof(takewhileobject),	/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)takewhile_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	takewhile_doc,			/* tp_doc */
-	(traverseproc)takewhile_traverse,    /* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)takewhile_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	takewhile_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.takewhile",              /* tp_name */
+    sizeof(takewhileobject),            /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)takewhile_dealloc,      /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    takewhile_doc,                      /* tp_doc */
+    (traverseproc)takewhile_traverse,    /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)takewhile_next,       /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    takewhile_new,                      /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* islice object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *it;
-	Py_ssize_t next;
-	Py_ssize_t stop;
-	Py_ssize_t step;
-	Py_ssize_t cnt;
+    PyObject_HEAD
+    PyObject *it;
+    Py_ssize_t next;
+    Py_ssize_t stop;
+    Py_ssize_t step;
+    Py_ssize_t cnt;
 } isliceobject;
 
 static PyTypeObject islice_type;
@@ -1117,126 +1117,126 @@ static PyTypeObject islice_type;
 static PyObject *
 islice_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *seq;
-	Py_ssize_t start=0, stop=-1, step=1;
-	PyObject *it, *a1=NULL, *a2=NULL, *a3=NULL;
-	Py_ssize_t numargs;
-	isliceobject *lz;
-
-	if (type == &islice_type && !_PyArg_NoKeywords("islice()", kwds))
-		return NULL;
-
-	if (!PyArg_UnpackTuple(args, "islice", 2, 4, &seq, &a1, &a2, &a3))
-		return NULL;
-
-	numargs = PyTuple_Size(args);
-	if (numargs == 2) {
-		if (a1 != Py_None) {
-			stop = PyInt_AsSsize_t(a1);
-			if (stop == -1) {
-				if (PyErr_Occurred())
-					PyErr_Clear();
-				PyErr_SetString(PyExc_ValueError,
-					"Stop argument for islice() must be None or an integer: 0 <= x <= maxint.");
-				return NULL;
-			}
-		}
-	} else {
-		if (a1 != Py_None)
-			start = PyInt_AsSsize_t(a1);
-		if (start == -1 && PyErr_Occurred())
-			PyErr_Clear();
-		if (a2 != Py_None) {
-			stop = PyInt_AsSsize_t(a2);
-			if (stop == -1) {
-				if (PyErr_Occurred())
-					PyErr_Clear();
-				PyErr_SetString(PyExc_ValueError,
-				   "Stop argument for islice() must be None or an integer: 0 <= x <= maxint.");
-				return NULL;
-			}
-		}
-	}
-	if (start<0 || stop<-1) {
-		PyErr_SetString(PyExc_ValueError,
-		   "Indices for islice() must be None or an integer: 0 <= x <= maxint.");
-		return NULL;
-	}
-
-	if (a3 != NULL) {
-		if (a3 != Py_None)
-			step = PyInt_AsSsize_t(a3);
-		if (step == -1 && PyErr_Occurred())
-			PyErr_Clear();
-	}
-	if (step<1) {
-		PyErr_SetString(PyExc_ValueError,
-		   "Step for islice() must be a positive integer or None.");
-		return NULL;
-	}
-
-	/* Get iterator. */
-	it = PyObject_GetIter(seq);
-	if (it == NULL)
-		return NULL;
-
-	/* create isliceobject structure */
-	lz = (isliceobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(it);
-		return NULL;
-	}
-	lz->it = it;
-	lz->next = start;
-	lz->stop = stop;
-	lz->step = step;
-	lz->cnt = 0L;
-
-	return (PyObject *)lz;
+    PyObject *seq;
+    Py_ssize_t start=0, stop=-1, step=1;
+    PyObject *it, *a1=NULL, *a2=NULL, *a3=NULL;
+    Py_ssize_t numargs;
+    isliceobject *lz;
+
+    if (type == &islice_type && !_PyArg_NoKeywords("islice()", kwds))
+        return NULL;
+
+    if (!PyArg_UnpackTuple(args, "islice", 2, 4, &seq, &a1, &a2, &a3))
+        return NULL;
+
+    numargs = PyTuple_Size(args);
+    if (numargs == 2) {
+        if (a1 != Py_None) {
+            stop = PyInt_AsSsize_t(a1);
+            if (stop == -1) {
+                if (PyErr_Occurred())
+                    PyErr_Clear();
+                PyErr_SetString(PyExc_ValueError,
+                    "Stop argument for islice() must be None or an integer: 0 <= x <= maxint.");
+                return NULL;
+            }
+        }
+    } else {
+        if (a1 != Py_None)
+            start = PyInt_AsSsize_t(a1);
+        if (start == -1 && PyErr_Occurred())
+            PyErr_Clear();
+        if (a2 != Py_None) {
+            stop = PyInt_AsSsize_t(a2);
+            if (stop == -1) {
+                if (PyErr_Occurred())
+                    PyErr_Clear();
+                PyErr_SetString(PyExc_ValueError,
+                   "Stop argument for islice() must be None or an integer: 0 <= x <= maxint.");
+                return NULL;
+            }
+        }
+    }
+    if (start<0 || stop<-1) {
+        PyErr_SetString(PyExc_ValueError,
+           "Indices for islice() must be None or an integer: 0 <= x <= maxint.");
+        return NULL;
+    }
+
+    if (a3 != NULL) {
+        if (a3 != Py_None)
+            step = PyInt_AsSsize_t(a3);
+        if (step == -1 && PyErr_Occurred())
+            PyErr_Clear();
+    }
+    if (step<1) {
+        PyErr_SetString(PyExc_ValueError,
+           "Step for islice() must be a positive integer or None.");
+        return NULL;
+    }
+
+    /* Get iterator. */
+    it = PyObject_GetIter(seq);
+    if (it == NULL)
+        return NULL;
+
+    /* create isliceobject structure */
+    lz = (isliceobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(it);
+        return NULL;
+    }
+    lz->it = it;
+    lz->next = start;
+    lz->stop = stop;
+    lz->step = step;
+    lz->cnt = 0L;
+
+    return (PyObject *)lz;
 }
 
 static void
 islice_dealloc(isliceobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->it);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->it);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 islice_traverse(isliceobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->it);
-	return 0;
+    Py_VISIT(lz->it);
+    return 0;
 }
 
 static PyObject *
 islice_next(isliceobject *lz)
 {
-	PyObject *item;
-	PyObject *it = lz->it;
-	Py_ssize_t oldnext;
-	PyObject *(*iternext)(PyObject *);
-
-	iternext = *Py_TYPE(it)->tp_iternext;
-	while (lz->cnt < lz->next) {
-		item = iternext(it);
-		if (item == NULL)
-			return NULL;
-		Py_DECREF(item);
-		lz->cnt++;
-	}
-	if (lz->stop != -1 && lz->cnt >= lz->stop)
-		return NULL;
-	item = iternext(it);
-	if (item == NULL)
-		return NULL;
-	lz->cnt++;
-	oldnext = lz->next;
-	lz->next += lz->step;
-	if (lz->next < oldnext)	/* Check for overflow */
-		lz->next = lz->stop;
-	return item;
+    PyObject *item;
+    PyObject *it = lz->it;
+    Py_ssize_t oldnext;
+    PyObject *(*iternext)(PyObject *);
+
+    iternext = *Py_TYPE(it)->tp_iternext;
+    while (lz->cnt < lz->next) {
+        item = iternext(it);
+        if (item == NULL)
+            return NULL;
+        Py_DECREF(item);
+        lz->cnt++;
+    }
+    if (lz->stop != -1 && lz->cnt >= lz->stop)
+        return NULL;
+    item = iternext(it);
+    if (item == NULL)
+        return NULL;
+    lz->cnt++;
+    oldnext = lz->next;
+    lz->next += lz->step;
+    if (lz->next < oldnext)     /* Check for overflow */
+        lz->next = lz->stop;
+    return item;
 }
 
 PyDoc_STRVAR(islice_doc,
@@ -1250,56 +1250,56 @@ skipped between successive calls.  Works like a slice() on a list\n\
 but returns an iterator.");
 
 static PyTypeObject islice_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.islice",		/* tp_name */
-	sizeof(isliceobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)islice_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	islice_doc,			/* tp_doc */
-	(traverseproc)islice_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)islice_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	islice_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.islice",                 /* tp_name */
+    sizeof(isliceobject),               /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)islice_dealloc,         /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    islice_doc,                         /* tp_doc */
+    (traverseproc)islice_traverse,      /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)islice_next,          /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    islice_new,                         /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* starmap object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *func;
-	PyObject *it;
+    PyObject_HEAD
+    PyObject *func;
+    PyObject *it;
 } starmapobject;
 
 static PyTypeObject starmap_type;
@@ -1307,71 +1307,71 @@ static PyTypeObject starmap_type;
 static PyObject *
 starmap_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *func, *seq;
-	PyObject *it;
-	starmapobject *lz;
-
-	if (type == &starmap_type && !_PyArg_NoKeywords("starmap()", kwds))
-		return NULL;
-
-	if (!PyArg_UnpackTuple(args, "starmap", 2, 2, &func, &seq))
-		return NULL;
-
-	/* Get iterator. */
-	it = PyObject_GetIter(seq);
-	if (it == NULL)
-		return NULL;
-
-	/* create starmapobject structure */
-	lz = (starmapobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(it);
-		return NULL;
-	}
-	Py_INCREF(func);
-	lz->func = func;
-	lz->it = it;
-
-	return (PyObject *)lz;
+    PyObject *func, *seq;
+    PyObject *it;
+    starmapobject *lz;
+
+    if (type == &starmap_type && !_PyArg_NoKeywords("starmap()", kwds))
+        return NULL;
+
+    if (!PyArg_UnpackTuple(args, "starmap", 2, 2, &func, &seq))
+        return NULL;
+
+    /* Get iterator. */
+    it = PyObject_GetIter(seq);
+    if (it == NULL)
+        return NULL;
+
+    /* create starmapobject structure */
+    lz = (starmapobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(it);
+        return NULL;
+    }
+    Py_INCREF(func);
+    lz->func = func;
+    lz->it = it;
+
+    return (PyObject *)lz;
 }
 
 static void
 starmap_dealloc(starmapobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->func);
-	Py_XDECREF(lz->it);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->func);
+    Py_XDECREF(lz->it);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 starmap_traverse(starmapobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->it);
-	Py_VISIT(lz->func);
-	return 0;
+    Py_VISIT(lz->it);
+    Py_VISIT(lz->func);
+    return 0;
 }
 
 static PyObject *
 starmap_next(starmapobject *lz)
 {
-	PyObject *args;
-	PyObject *result;
-	PyObject *it = lz->it;
-
-	args = (*Py_TYPE(it)->tp_iternext)(it);
-	if (args == NULL)
-		return NULL;
-	if (!PyTuple_CheckExact(args)) {
-		PyObject *newargs = PySequence_Tuple(args);
-		Py_DECREF(args);
-		if (newargs == NULL)
-			return NULL;
-		args = newargs;
-	}
-	result = PyObject_Call(lz->func, args, NULL);
-	Py_DECREF(args);
-	return result;
+    PyObject *args;
+    PyObject *result;
+    PyObject *it = lz->it;
+
+    args = (*Py_TYPE(it)->tp_iternext)(it);
+    if (args == NULL)
+        return NULL;
+    if (!PyTuple_CheckExact(args)) {
+        PyObject *newargs = PySequence_Tuple(args);
+        Py_DECREF(args);
+        if (newargs == NULL)
+            return NULL;
+        args = newargs;
+    }
+    result = PyObject_Call(lz->func, args, NULL);
+    Py_DECREF(args);
+    return result;
 }
 
 PyDoc_STRVAR(starmap_doc,
@@ -1381,56 +1381,56 @@ Return an iterator whose values are returned from the function evaluated\n\
 with a argument tuple taken from the given sequence.");
 
 static PyTypeObject starmap_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.starmap",		/* tp_name */
-	sizeof(starmapobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)starmap_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	starmap_doc,			/* tp_doc */
-	(traverseproc)starmap_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)starmap_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	starmap_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.starmap",                /* tp_name */
+    sizeof(starmapobject),              /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)starmap_dealloc,        /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    starmap_doc,                        /* tp_doc */
+    (traverseproc)starmap_traverse,     /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)starmap_next,         /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    starmap_new,                        /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* imap object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *iters;
-	PyObject *func;
+    PyObject_HEAD
+    PyObject *iters;
+    PyObject *func;
 } imapobject;
 
 static PyTypeObject imap_type;
@@ -1438,66 +1438,66 @@ static PyTypeObject imap_type;
 static PyObject *
 imap_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *it, *iters, *func;
-	imapobject *lz;
-	Py_ssize_t numargs, i;
-
-	if (type == &imap_type && !_PyArg_NoKeywords("imap()", kwds))
-		return NULL;
-
-	numargs = PyTuple_Size(args);
-	if (numargs < 2) {
-		PyErr_SetString(PyExc_TypeError,
-		   "imap() must have at least two arguments.");
-		return NULL;
-	}
-
-	iters = PyTuple_New(numargs-1);
-	if (iters == NULL)
-		return NULL;
-
-	for (i=1 ; i<numargs ; i++) {
-		/* Get iterator. */
-		it = PyObject_GetIter(PyTuple_GET_ITEM(args, i));
-		if (it == NULL) {
-			Py_DECREF(iters);
-			return NULL;
-		}
-		PyTuple_SET_ITEM(iters, i-1, it);
-	}
-
-	/* create imapobject structure */
-	lz = (imapobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(iters);
-		return NULL;
-	}
-	lz->iters = iters;
-	func = PyTuple_GET_ITEM(args, 0);
-	Py_INCREF(func);
-	lz->func = func;
-
-	return (PyObject *)lz;
+    PyObject *it, *iters, *func;
+    imapobject *lz;
+    Py_ssize_t numargs, i;
+
+    if (type == &imap_type && !_PyArg_NoKeywords("imap()", kwds))
+        return NULL;
+
+    numargs = PyTuple_Size(args);
+    if (numargs < 2) {
+        PyErr_SetString(PyExc_TypeError,
+           "imap() must have at least two arguments.");
+        return NULL;
+    }
+
+    iters = PyTuple_New(numargs-1);
+    if (iters == NULL)
+        return NULL;
+
+    for (i=1 ; i<numargs ; i++) {
+        /* Get iterator. */
+        it = PyObject_GetIter(PyTuple_GET_ITEM(args, i));
+        if (it == NULL) {
+            Py_DECREF(iters);
+            return NULL;
+        }
+        PyTuple_SET_ITEM(iters, i-1, it);
+    }
+
+    /* create imapobject structure */
+    lz = (imapobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(iters);
+        return NULL;
+    }
+    lz->iters = iters;
+    func = PyTuple_GET_ITEM(args, 0);
+    Py_INCREF(func);
+    lz->func = func;
+
+    return (PyObject *)lz;
 }
 
 static void
 imap_dealloc(imapobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->iters);
-	Py_XDECREF(lz->func);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->iters);
+    Py_XDECREF(lz->func);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 imap_traverse(imapobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->iters);
-	Py_VISIT(lz->func);
-	return 0;
+    Py_VISIT(lz->iters);
+    Py_VISIT(lz->func);
+    return 0;
 }
 
-/*	
+/*
 imap() is an iterator version of __builtins__.map() except that it does
 not have the None fill-in feature.  That was intentionally left out for
 the following reasons:
@@ -1508,15 +1508,15 @@ the following reasons:
      infinite iterators like count() and repeat() (for supplying sequential
      or constant arguments to a function).
 
-  2) In typical use cases for combining itertools, having one finite data 
+  2) In typical use cases for combining itertools, having one finite data
      supplier run out before another is likely to be an error condition which
      should not pass silently by automatically supplying None.
 
   3) The use cases for automatic None fill-in are rare -- not many functions
      do something useful when a parameter suddenly switches type and becomes
-     None.  
+     None.
 
-  4) If a need does arise, it can be met by __builtins__.map() or by 
+  4) If a need does arise, it can be met by __builtins__.map() or by
      writing:  chain(iterable, repeat(None)).
 
   5) Similar toolsets in Haskell and SML do not have automatic None fill-in.
@@ -1525,187 +1525,187 @@ the following reasons:
 static PyObject *
 imap_next(imapobject *lz)
 {
-	PyObject *val;
-	PyObject *argtuple;
-	PyObject *result;
-	Py_ssize_t numargs, i;
-
-	numargs = PyTuple_Size(lz->iters);
-	argtuple = PyTuple_New(numargs);
-	if (argtuple == NULL)
-		return NULL;
-
-	for (i=0 ; i<numargs ; i++) {
-		val = PyIter_Next(PyTuple_GET_ITEM(lz->iters, i));
-		if (val == NULL) {
-			Py_DECREF(argtuple);
-			return NULL;
-		}
-		PyTuple_SET_ITEM(argtuple, i, val);
-	}
-	if (lz->func == Py_None) 
-		return argtuple;
-	result = PyObject_Call(lz->func, argtuple, NULL);
-	Py_DECREF(argtuple);
-	return result;
+    PyObject *val;
+    PyObject *argtuple;
+    PyObject *result;
+    Py_ssize_t numargs, i;
+
+    numargs = PyTuple_Size(lz->iters);
+    argtuple = PyTuple_New(numargs);
+    if (argtuple == NULL)
+        return NULL;
+
+    for (i=0 ; i<numargs ; i++) {
+        val = PyIter_Next(PyTuple_GET_ITEM(lz->iters, i));
+        if (val == NULL) {
+            Py_DECREF(argtuple);
+            return NULL;
+        }
+        PyTuple_SET_ITEM(argtuple, i, val);
+    }
+    if (lz->func == Py_None)
+        return argtuple;
+    result = PyObject_Call(lz->func, argtuple, NULL);
+    Py_DECREF(argtuple);
+    return result;
 }
 
 PyDoc_STRVAR(imap_doc,
 "imap(func, *iterables) --> imap object\n\
 \n\
 Make an iterator that computes the function using arguments from\n\
-each of the iterables.	Like map() except that it returns\n\
+each of the iterables.  Like map() except that it returns\n\
 an iterator instead of a list and that it stops when the shortest\n\
 iterable is exhausted instead of filling in None for shorter\n\
 iterables.");
 
 static PyTypeObject imap_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.imap",		/* tp_name */
-	sizeof(imapobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)imap_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	imap_doc,			/* tp_doc */
-	(traverseproc)imap_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)imap_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	imap_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.imap",                   /* tp_name */
+    sizeof(imapobject),                 /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)imap_dealloc,           /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    imap_doc,                           /* tp_doc */
+    (traverseproc)imap_traverse,        /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)imap_next,            /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    imap_new,                           /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* chain object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *source;		/* Iterator over input iterables */
-	PyObject *active;		/* Currently running input iterator */
+    PyObject_HEAD
+    PyObject *source;                   /* Iterator over input iterables */
+    PyObject *active;                   /* Currently running input iterator */
 } chainobject;
 
 static PyTypeObject chain_type;
 
-static PyObject * 
+static PyObject *
 chain_new_internal(PyTypeObject *type, PyObject *source)
 {
-	chainobject *lz;
-
-	lz = (chainobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(source);
-		return NULL;
-	}
-	
-	lz->source = source;
-	lz->active = NULL;
-	return (PyObject *)lz;
+    chainobject *lz;
+
+    lz = (chainobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(source);
+        return NULL;
+    }
+
+    lz->source = source;
+    lz->active = NULL;
+    return (PyObject *)lz;
 }
 
 static PyObject *
 chain_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *source;
+    PyObject *source;
+
+    if (type == &chain_type && !_PyArg_NoKeywords("chain()", kwds))
+        return NULL;
 
-	if (type == &chain_type && !_PyArg_NoKeywords("chain()", kwds))
-		return NULL;
-	
-	source = PyObject_GetIter(args);
-	if (source == NULL)
-		return NULL;
+    source = PyObject_GetIter(args);
+    if (source == NULL)
+        return NULL;
 
-	return chain_new_internal(type, source);
+    return chain_new_internal(type, source);
 }
 
 static PyObject *
 chain_new_from_iterable(PyTypeObject *type, PyObject *arg)
 {
-	PyObject *source;
-	
-	source = PyObject_GetIter(arg);
-	if (source == NULL)
-		return NULL;
+    PyObject *source;
 
-	return chain_new_internal(type, source);
+    source = PyObject_GetIter(arg);
+    if (source == NULL)
+        return NULL;
+
+    return chain_new_internal(type, source);
 }
 
 static void
 chain_dealloc(chainobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->active);
-	Py_XDECREF(lz->source);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->active);
+    Py_XDECREF(lz->source);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 chain_traverse(chainobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->source);
-	Py_VISIT(lz->active);
-	return 0;
+    Py_VISIT(lz->source);
+    Py_VISIT(lz->active);
+    return 0;
 }
 
 static PyObject *
 chain_next(chainobject *lz)
 {
-	PyObject *item;
-
-	if (lz->source == NULL)
-		return NULL;				/* already stopped */
-
-	if (lz->active == NULL) {
-		PyObject *iterable = PyIter_Next(lz->source);
-		if (iterable == NULL) {
-			Py_CLEAR(lz->source);
-			return NULL;			/* no more input sources */
-		}
-		lz->active = PyObject_GetIter(iterable);
-		Py_DECREF(iterable);
-		if (lz->active == NULL) {
-			Py_CLEAR(lz->source);
-			return NULL;			/* input not iterable */
-		}
-	}
-	item = PyIter_Next(lz->active);
-	if (item != NULL)
-		return item;
-	if (PyErr_Occurred()) {
-		if (PyErr_ExceptionMatches(PyExc_StopIteration))
-			PyErr_Clear();
-		else
-			return NULL; 			/* input raised an exception */
-	}
-	Py_CLEAR(lz->active);
-	return chain_next(lz);			/* recurse and use next active */
+    PyObject *item;
+
+    if (lz->source == NULL)
+        return NULL;                                    /* already stopped */
+
+    if (lz->active == NULL) {
+        PyObject *iterable = PyIter_Next(lz->source);
+        if (iterable == NULL) {
+            Py_CLEAR(lz->source);
+            return NULL;                                /* no more input sources */
+        }
+        lz->active = PyObject_GetIter(iterable);
+        Py_DECREF(iterable);
+        if (lz->active == NULL) {
+            Py_CLEAR(lz->source);
+            return NULL;                                /* input not iterable */
+        }
+    }
+    item = PyIter_Next(lz->active);
+    if (item != NULL)
+        return item;
+    if (PyErr_Occurred()) {
+        if (PyErr_ExceptionMatches(PyExc_StopIteration))
+            PyErr_Clear();
+        else
+            return NULL;                                /* input raised an exception */
+    }
+    Py_CLEAR(lz->active);
+    return chain_next(lz);                      /* recurse and use next active */
 }
 
 PyDoc_STRVAR(chain_doc,
@@ -1722,64 +1722,64 @@ Alternate chain() contructor taking a single iterable argument\n\
 that evaluates lazily.");
 
 static PyMethodDef chain_methods[] = {
-	{"from_iterable", (PyCFunction) chain_new_from_iterable,	METH_O | METH_CLASS,
-		chain_from_iterable_doc},
-	{NULL,		NULL}	/* sentinel */
+    {"from_iterable", (PyCFunction) chain_new_from_iterable,            METH_O | METH_CLASS,
+        chain_from_iterable_doc},
+    {NULL,              NULL}   /* sentinel */
 };
 
 static PyTypeObject chain_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.chain",		/* tp_name */
-	sizeof(chainobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)chain_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	chain_doc,			/* tp_doc */
-	(traverseproc)chain_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)chain_next,	/* tp_iternext */
-	chain_methods,			/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	chain_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.chain",                  /* tp_name */
+    sizeof(chainobject),                /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)chain_dealloc,          /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    chain_doc,                          /* tp_doc */
+    (traverseproc)chain_traverse,       /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)chain_next,           /* tp_iternext */
+    chain_methods,                      /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    chain_new,                          /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* product object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *pools;		/* tuple of pool tuples */
-	Py_ssize_t *indices;            /* one index per pool */
-	PyObject *result;               /* most recently returned result tuple */
-	int stopped;                    /* set to 1 when the product iterator is exhausted */
+    PyObject_HEAD
+    PyObject *pools;                    /* tuple of pool tuples */
+    Py_ssize_t *indices;            /* one index per pool */
+    PyObject *result;               /* most recently returned result tuple */
+    int stopped;                    /* set to 1 when the product iterator is exhausted */
 } productobject;
 
 static PyTypeObject product_type;
@@ -1787,181 +1787,181 @@ static PyTypeObject product_type;
 static PyObject *
 product_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	productobject *lz;
-	Py_ssize_t nargs, npools, repeat=1;
-	PyObject *pools = NULL;
-	Py_ssize_t *indices = NULL;
-	Py_ssize_t i;
-
-	if (kwds != NULL) {
-		char *kwlist[] = {"repeat", 0};
-		PyObject *tmpargs = PyTuple_New(0);
-		if (tmpargs == NULL)
-			return NULL;
-		if (!PyArg_ParseTupleAndKeywords(tmpargs, kwds, "|n:product", kwlist, &repeat)) {
-			Py_DECREF(tmpargs);
-			return NULL;
-		}
-		Py_DECREF(tmpargs);
-		if (repeat < 0) {
-			PyErr_SetString(PyExc_ValueError, 
-					"repeat argument cannot be negative");
-			return NULL;
-		}
-	}
-
-	assert(PyTuple_Check(args));
-	nargs = (repeat == 0) ? 0 : PyTuple_GET_SIZE(args);
-	npools = nargs * repeat;
-
-	indices = PyMem_Malloc(npools * sizeof(Py_ssize_t));
-	if (indices == NULL) {
-    		PyErr_NoMemory();
-		goto error;
-	}
-
-	pools = PyTuple_New(npools);
-	if (pools == NULL)
-		goto error;
-
-	for (i=0; i < nargs ; ++i) {
-		PyObject *item = PyTuple_GET_ITEM(args, i);
-		PyObject *pool = PySequence_Tuple(item);
-		if (pool == NULL)
-			goto error;
-		PyTuple_SET_ITEM(pools, i, pool);
-		indices[i] = 0;
-	}
-	for ( ; i < npools; ++i) {
-		PyObject *pool = PyTuple_GET_ITEM(pools, i - nargs);
-		Py_INCREF(pool);
-		PyTuple_SET_ITEM(pools, i, pool);
-		indices[i] = 0;
-	}
-
-	/* create productobject structure */
-	lz = (productobject *)type->tp_alloc(type, 0);
-	if (lz == NULL)
-		goto error;
-
-	lz->pools = pools;
-	lz->indices = indices;
-	lz->result = NULL;
-	lz->stopped = 0;
-
-	return (PyObject *)lz;
+    productobject *lz;
+    Py_ssize_t nargs, npools, repeat=1;
+    PyObject *pools = NULL;
+    Py_ssize_t *indices = NULL;
+    Py_ssize_t i;
+
+    if (kwds != NULL) {
+        char *kwlist[] = {"repeat", 0};
+        PyObject *tmpargs = PyTuple_New(0);
+        if (tmpargs == NULL)
+            return NULL;
+        if (!PyArg_ParseTupleAndKeywords(tmpargs, kwds, "|n:product", kwlist, &repeat)) {
+            Py_DECREF(tmpargs);
+            return NULL;
+        }
+        Py_DECREF(tmpargs);
+        if (repeat < 0) {
+            PyErr_SetString(PyExc_ValueError,
+                            "repeat argument cannot be negative");
+            return NULL;
+        }
+    }
+
+    assert(PyTuple_Check(args));
+    nargs = (repeat == 0) ? 0 : PyTuple_GET_SIZE(args);
+    npools = nargs * repeat;
+
+    indices = PyMem_Malloc(npools * sizeof(Py_ssize_t));
+    if (indices == NULL) {
+        PyErr_NoMemory();
+        goto error;
+    }
+
+    pools = PyTuple_New(npools);
+    if (pools == NULL)
+        goto error;
+
+    for (i=0; i < nargs ; ++i) {
+        PyObject *item = PyTuple_GET_ITEM(args, i);
+        PyObject *pool = PySequence_Tuple(item);
+        if (pool == NULL)
+            goto error;
+        PyTuple_SET_ITEM(pools, i, pool);
+        indices[i] = 0;
+    }
+    for ( ; i < npools; ++i) {
+        PyObject *pool = PyTuple_GET_ITEM(pools, i - nargs);
+        Py_INCREF(pool);
+        PyTuple_SET_ITEM(pools, i, pool);
+        indices[i] = 0;
+    }
+
+    /* create productobject structure */
+    lz = (productobject *)type->tp_alloc(type, 0);
+    if (lz == NULL)
+        goto error;
+
+    lz->pools = pools;
+    lz->indices = indices;
+    lz->result = NULL;
+    lz->stopped = 0;
+
+    return (PyObject *)lz;
 
 error:
-	if (indices != NULL)
-		PyMem_Free(indices);
-	Py_XDECREF(pools);
-	return NULL;
+    if (indices != NULL)
+        PyMem_Free(indices);
+    Py_XDECREF(pools);
+    return NULL;
 }
 
 static void
 product_dealloc(productobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->pools);
-	Py_XDECREF(lz->result);
-	if (lz->indices != NULL)
-		PyMem_Free(lz->indices);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->pools);
+    Py_XDECREF(lz->result);
+    if (lz->indices != NULL)
+        PyMem_Free(lz->indices);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 product_traverse(productobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->pools);
-	Py_VISIT(lz->result);
-	return 0;
+    Py_VISIT(lz->pools);
+    Py_VISIT(lz->result);
+    return 0;
 }
 
 static PyObject *
 product_next(productobject *lz)
 {
-	PyObject *pool;
-	PyObject *elem;
-	PyObject *oldelem;
-	PyObject *pools = lz->pools;
-	PyObject *result = lz->result;
-	Py_ssize_t npools = PyTuple_GET_SIZE(pools);
-	Py_ssize_t i;
-
-	if (lz->stopped)
-		return NULL;
-
-	if (result == NULL) {
-                /* On the first pass, return an initial tuple filled with the 
-                   first element from each pool. */
-		result = PyTuple_New(npools);
-		if (result == NULL)
-            		goto empty;
-		lz->result = result;
-		for (i=0; i < npools; i++) {
-			pool = PyTuple_GET_ITEM(pools, i);
-			if (PyTuple_GET_SIZE(pool) == 0)
-				goto empty;
-    			elem = PyTuple_GET_ITEM(pool, 0);
-    			Py_INCREF(elem);
-    			PyTuple_SET_ITEM(result, i, elem);
-		}
-	} else {
-		Py_ssize_t *indices = lz->indices;
-
-		/* Copy the previous result tuple or re-use it if available */
-		if (Py_REFCNT(result) > 1) {
-			PyObject *old_result = result;
-			result = PyTuple_New(npools);
-			if (result == NULL)
-				goto empty;
-			lz->result = result;
-			for (i=0; i < npools; i++) {
-				elem = PyTuple_GET_ITEM(old_result, i);
-    				Py_INCREF(elem);
-    				PyTuple_SET_ITEM(result, i, elem);
-			}
-			Py_DECREF(old_result);
-		}
-		/* Now, we've got the only copy so we can update it in-place */
-		assert (npools==0 || Py_REFCNT(result) == 1);
-
-                /* Update the pool indices right-to-left.  Only advance to the
-                   next pool when the previous one rolls-over */
-		for (i=npools-1 ; i >= 0 ; i--) {
-			pool = PyTuple_GET_ITEM(pools, i);
-			indices[i]++;
-			if (indices[i] == PyTuple_GET_SIZE(pool)) {
-				/* Roll-over and advance to next pool */
-				indices[i] = 0;
-				elem = PyTuple_GET_ITEM(pool, 0);
-				Py_INCREF(elem);
-				oldelem = PyTuple_GET_ITEM(result, i);
-				PyTuple_SET_ITEM(result, i, elem);
-				Py_DECREF(oldelem);
-			} else {
-				/* No rollover. Just increment and stop here. */
-				elem = PyTuple_GET_ITEM(pool, indices[i]);
-				Py_INCREF(elem);
-				oldelem = PyTuple_GET_ITEM(result, i);
-				PyTuple_SET_ITEM(result, i, elem);
-				Py_DECREF(oldelem);
-				break;
-			}
-		}
-
-		/* If i is negative, then the indices have all rolled-over
-                   and we're done. */
-		if (i < 0)
-			goto empty;
-	}
-
-	Py_INCREF(result);
-	return result;
+    PyObject *pool;
+    PyObject *elem;
+    PyObject *oldelem;
+    PyObject *pools = lz->pools;
+    PyObject *result = lz->result;
+    Py_ssize_t npools = PyTuple_GET_SIZE(pools);
+    Py_ssize_t i;
+
+    if (lz->stopped)
+        return NULL;
+
+    if (result == NULL) {
+        /* On the first pass, return an initial tuple filled with the
+           first element from each pool. */
+        result = PyTuple_New(npools);
+        if (result == NULL)
+            goto empty;
+        lz->result = result;
+        for (i=0; i < npools; i++) {
+            pool = PyTuple_GET_ITEM(pools, i);
+            if (PyTuple_GET_SIZE(pool) == 0)
+                goto empty;
+            elem = PyTuple_GET_ITEM(pool, 0);
+            Py_INCREF(elem);
+            PyTuple_SET_ITEM(result, i, elem);
+        }
+    } else {
+        Py_ssize_t *indices = lz->indices;
+
+        /* Copy the previous result tuple or re-use it if available */
+        if (Py_REFCNT(result) > 1) {
+            PyObject *old_result = result;
+            result = PyTuple_New(npools);
+            if (result == NULL)
+                goto empty;
+            lz->result = result;
+            for (i=0; i < npools; i++) {
+                elem = PyTuple_GET_ITEM(old_result, i);
+                Py_INCREF(elem);
+                PyTuple_SET_ITEM(result, i, elem);
+            }
+            Py_DECREF(old_result);
+        }
+        /* Now, we've got the only copy so we can update it in-place */
+        assert (npools==0 || Py_REFCNT(result) == 1);
+
+        /* Update the pool indices right-to-left.  Only advance to the
+           next pool when the previous one rolls-over */
+        for (i=npools-1 ; i >= 0 ; i--) {
+            pool = PyTuple_GET_ITEM(pools, i);
+            indices[i]++;
+            if (indices[i] == PyTuple_GET_SIZE(pool)) {
+                /* Roll-over and advance to next pool */
+                indices[i] = 0;
+                elem = PyTuple_GET_ITEM(pool, 0);
+                Py_INCREF(elem);
+                oldelem = PyTuple_GET_ITEM(result, i);
+                PyTuple_SET_ITEM(result, i, elem);
+                Py_DECREF(oldelem);
+            } else {
+                /* No rollover. Just increment and stop here. */
+                elem = PyTuple_GET_ITEM(pool, indices[i]);
+                Py_INCREF(elem);
+                oldelem = PyTuple_GET_ITEM(result, i);
+                PyTuple_SET_ITEM(result, i, elem);
+                Py_DECREF(oldelem);
+                break;
+            }
+        }
+
+        /* If i is negative, then the indices have all rolled-over
+           and we're done. */
+        if (i < 0)
+            goto empty;
+    }
+
+    Py_INCREF(result);
+    return result;
 
 empty:
-	lz->stopped = 1;
-	return NULL;
+    lz->stopped = 1;
+    return NULL;
 }
 
 PyDoc_STRVAR(product_doc,
@@ -1979,59 +1979,59 @@ product('ab', range(3)) --> ('a',0) ('a',1) ('a',2) ('b',0) ('b',1) ('b',2)\n\
 product((0,1), (0,1), (0,1)) --> (0,0,0) (0,0,1) (0,1,0) (0,1,1) (1,0,0) ...");
 
 static PyTypeObject product_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.product",		/* tp_name */
-	sizeof(productobject),	/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)product_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	product_doc,			/* tp_doc */
-	(traverseproc)product_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)product_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	product_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.product",                /* tp_name */
+    sizeof(productobject),      /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)product_dealloc,        /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    product_doc,                        /* tp_doc */
+    (traverseproc)product_traverse,     /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)product_next,         /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    product_new,                        /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* combinations object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *pool;			/* input converted to a tuple */
-	Py_ssize_t *indices;            /* one index per result element */
-	PyObject *result;               /* most recently returned result tuple */
-	Py_ssize_t r;			/* size of result tuple */
-	int stopped;			/* set to 1 when the combinations iterator is exhausted */
+    PyObject_HEAD
+    PyObject *pool;                     /* input converted to a tuple */
+    Py_ssize_t *indices;            /* one index per result element */
+    PyObject *result;               /* most recently returned result tuple */
+    Py_ssize_t r;                       /* size of result tuple */
+    int stopped;                        /* set to 1 when the combinations iterator is exhausted */
 } combinationsobject;
 
 static PyTypeObject combinations_type;
@@ -2039,160 +2039,160 @@ static PyTypeObject combinations_type;
 static PyObject *
 combinations_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	combinationsobject *co;
-	Py_ssize_t n;
-	Py_ssize_t r;
-	PyObject *pool = NULL;
-	PyObject *iterable = NULL;
-	Py_ssize_t *indices = NULL;
-	Py_ssize_t i;
-	static char *kwargs[] = {"iterable", "r", NULL};
- 
- 	if (!PyArg_ParseTupleAndKeywords(args, kwds, "On:combinations", kwargs, 
-					 &iterable, &r))
-		return NULL;
-
-	pool = PySequence_Tuple(iterable);
-	if (pool == NULL)
-		goto error;
-	n = PyTuple_GET_SIZE(pool);
-	if (r < 0) {
-		PyErr_SetString(PyExc_ValueError, "r must be non-negative");
-		goto error;
-	}
-
-	indices = PyMem_Malloc(r * sizeof(Py_ssize_t));
-	if (indices == NULL) {
-    		PyErr_NoMemory();
-		goto error;
-	}
-
-	for (i=0 ; i<r ; i++)
-		indices[i] = i;
-
-	/* create combinationsobject structure */
-	co = (combinationsobject *)type->tp_alloc(type, 0);
-	if (co == NULL)
-		goto error;
-
-	co->pool = pool;
-	co->indices = indices;
-	co->result = NULL;
-	co->r = r;
-	co->stopped = r > n ? 1 : 0;
-
-	return (PyObject *)co;
+    combinationsobject *co;
+    Py_ssize_t n;
+    Py_ssize_t r;
+    PyObject *pool = NULL;
+    PyObject *iterable = NULL;
+    Py_ssize_t *indices = NULL;
+    Py_ssize_t i;
+    static char *kwargs[] = {"iterable", "r", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "On:combinations", kwargs,
+                                     &iterable, &r))
+        return NULL;
+
+    pool = PySequence_Tuple(iterable);
+    if (pool == NULL)
+        goto error;
+    n = PyTuple_GET_SIZE(pool);
+    if (r < 0) {
+        PyErr_SetString(PyExc_ValueError, "r must be non-negative");
+        goto error;
+    }
+
+    indices = PyMem_Malloc(r * sizeof(Py_ssize_t));
+    if (indices == NULL) {
+        PyErr_NoMemory();
+        goto error;
+    }
+
+    for (i=0 ; i<r ; i++)
+        indices[i] = i;
+
+    /* create combinationsobject structure */
+    co = (combinationsobject *)type->tp_alloc(type, 0);
+    if (co == NULL)
+        goto error;
+
+    co->pool = pool;
+    co->indices = indices;
+    co->result = NULL;
+    co->r = r;
+    co->stopped = r > n ? 1 : 0;
+
+    return (PyObject *)co;
 
 error:
-	if (indices != NULL)
-		PyMem_Free(indices);
-	Py_XDECREF(pool);
-	return NULL;
+    if (indices != NULL)
+        PyMem_Free(indices);
+    Py_XDECREF(pool);
+    return NULL;
 }
 
 static void
 combinations_dealloc(combinationsobject *co)
 {
-	PyObject_GC_UnTrack(co);
-	Py_XDECREF(co->pool);
-	Py_XDECREF(co->result);
-	if (co->indices != NULL)
-		PyMem_Free(co->indices);
-	Py_TYPE(co)->tp_free(co);
+    PyObject_GC_UnTrack(co);
+    Py_XDECREF(co->pool);
+    Py_XDECREF(co->result);
+    if (co->indices != NULL)
+        PyMem_Free(co->indices);
+    Py_TYPE(co)->tp_free(co);
 }
 
 static int
 combinations_traverse(combinationsobject *co, visitproc visit, void *arg)
 {
-	Py_VISIT(co->pool);
-	Py_VISIT(co->result);
-	return 0;
+    Py_VISIT(co->pool);
+    Py_VISIT(co->result);
+    return 0;
 }
 
 static PyObject *
 combinations_next(combinationsobject *co)
 {
-	PyObject *elem;
-	PyObject *oldelem;
-	PyObject *pool = co->pool;
-	Py_ssize_t *indices = co->indices;
-	PyObject *result = co->result;
-	Py_ssize_t n = PyTuple_GET_SIZE(pool);
-	Py_ssize_t r = co->r;
-	Py_ssize_t i, j, index;
-
-	if (co->stopped)
-		return NULL;
-
-	if (result == NULL) {
-                /* On the first pass, initialize result tuple using the indices */
-		result = PyTuple_New(r);
-		if (result == NULL)
-            		goto empty;
-		co->result = result;
-		for (i=0; i<r ; i++) {
-			index = indices[i];
-    			elem = PyTuple_GET_ITEM(pool, index);
-    			Py_INCREF(elem);
-    			PyTuple_SET_ITEM(result, i, elem);
-		}
-	} else {
-		/* Copy the previous result tuple or re-use it if available */
-		if (Py_REFCNT(result) > 1) {
-			PyObject *old_result = result;
-			result = PyTuple_New(r);
-			if (result == NULL)
-				goto empty;
-			co->result = result;
-			for (i=0; i<r ; i++) {
-				elem = PyTuple_GET_ITEM(old_result, i);
-    				Py_INCREF(elem);
-    				PyTuple_SET_ITEM(result, i, elem);
-			}
-			Py_DECREF(old_result);
-		}
-		/* Now, we've got the only copy so we can update it in-place 
-		 * CPython's empty tuple is a singleton and cached in 
-		 * PyTuple's freelist. 
-		 */
-		assert(r == 0 || Py_REFCNT(result) == 1);
-
-                /* Scan indices right-to-left until finding one that is not
-                   at its maximum (i + n - r). */
-		for (i=r-1 ; i >= 0 && indices[i] == i+n-r ; i--)
-			;
-
-		/* If i is negative, then the indices are all at
-                   their maximum value and we're done. */
-		if (i < 0)
-			goto empty;
-
-		/* Increment the current index which we know is not at its
-                   maximum.  Then move back to the right setting each index
-                   to its lowest possible value (one higher than the index
-                   to its left -- this maintains the sort order invariant). */
-		indices[i]++;
-		for (j=i+1 ; j<r ; j++)
-			indices[j] = indices[j-1] + 1;
-
-		/* Update the result tuple for the new indices
-		   starting with i, the leftmost index that changed */
-		for ( ; i<r ; i++) {
-			index = indices[i];
-			elem = PyTuple_GET_ITEM(pool, index);
-			Py_INCREF(elem);
-			oldelem = PyTuple_GET_ITEM(result, i);
-			PyTuple_SET_ITEM(result, i, elem);
-			Py_DECREF(oldelem);
-		}
-	}
-
-	Py_INCREF(result);
-	return result;
+    PyObject *elem;
+    PyObject *oldelem;
+    PyObject *pool = co->pool;
+    Py_ssize_t *indices = co->indices;
+    PyObject *result = co->result;
+    Py_ssize_t n = PyTuple_GET_SIZE(pool);
+    Py_ssize_t r = co->r;
+    Py_ssize_t i, j, index;
+
+    if (co->stopped)
+        return NULL;
+
+    if (result == NULL) {
+        /* On the first pass, initialize result tuple using the indices */
+        result = PyTuple_New(r);
+        if (result == NULL)
+            goto empty;
+        co->result = result;
+        for (i=0; i<r ; i++) {
+            index = indices[i];
+            elem = PyTuple_GET_ITEM(pool, index);
+            Py_INCREF(elem);
+            PyTuple_SET_ITEM(result, i, elem);
+        }
+    } else {
+        /* Copy the previous result tuple or re-use it if available */
+        if (Py_REFCNT(result) > 1) {
+            PyObject *old_result = result;
+            result = PyTuple_New(r);
+            if (result == NULL)
+                goto empty;
+            co->result = result;
+            for (i=0; i<r ; i++) {
+                elem = PyTuple_GET_ITEM(old_result, i);
+                Py_INCREF(elem);
+                PyTuple_SET_ITEM(result, i, elem);
+            }
+            Py_DECREF(old_result);
+        }
+        /* Now, we've got the only copy so we can update it in-place
+         * CPython's empty tuple is a singleton and cached in
+         * PyTuple's freelist.
+         */
+        assert(r == 0 || Py_REFCNT(result) == 1);
+
+        /* Scan indices right-to-left until finding one that is not
+           at its maximum (i + n - r). */
+        for (i=r-1 ; i >= 0 && indices[i] == i+n-r ; i--)
+            ;
+
+        /* If i is negative, then the indices are all at
+           their maximum value and we're done. */
+        if (i < 0)
+            goto empty;
+
+        /* Increment the current index which we know is not at its
+           maximum.  Then move back to the right setting each index
+           to its lowest possible value (one higher than the index
+           to its left -- this maintains the sort order invariant). */
+        indices[i]++;
+        for (j=i+1 ; j<r ; j++)
+            indices[j] = indices[j-1] + 1;
+
+        /* Update the result tuple for the new indices
+           starting with i, the leftmost index that changed */
+        for ( ; i<r ; i++) {
+            index = indices[i];
+            elem = PyTuple_GET_ITEM(pool, index);
+            Py_INCREF(elem);
+            oldelem = PyTuple_GET_ITEM(result, i);
+            PyTuple_SET_ITEM(result, i, elem);
+            Py_DECREF(oldelem);
+        }
+    }
+
+    Py_INCREF(result);
+    return result;
 
 empty:
-	co->stopped = 1;
-	return NULL;
+    co->stopped = 1;
+    return NULL;
 }
 
 PyDoc_STRVAR(combinations_doc,
@@ -2202,47 +2202,47 @@ Return successive r-length combinations of elements in the iterable.\n\n\
 combinations(range(4), 3) --> (0,1,2), (0,1,3), (0,2,3), (1,2,3)");
 
 static PyTypeObject combinations_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.combinations",		/* tp_name */
-	sizeof(combinationsobject),	/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)combinations_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	combinations_doc,			/* tp_doc */
-	(traverseproc)combinations_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)combinations_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	combinations_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.combinations",                   /* tp_name */
+    sizeof(combinationsobject),         /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)combinations_dealloc,           /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    combinations_doc,                           /* tp_doc */
+    (traverseproc)combinations_traverse,        /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)combinations_next,            /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    combinations_new,                           /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
@@ -2250,37 +2250,37 @@ static PyTypeObject combinations_type = {
 
 /* Equivalent to:
 
-		def combinations_with_replacement(iterable, r):
-			"combinations_with_replacement('ABC', 2) --> AA AB AC BB BC CC"
-			# number items returned:  (n+r-1)! / r! / (n-1)!
-			pool = tuple(iterable)
-			n = len(pool)
-			indices = [0] * r
-			yield tuple(pool[i] for i in indices)   
-			while 1:
-				for i in reversed(range(r)):
-					if indices[i] != n - 1:
-						break
-				else:
-					return
-				indices[i:] = [indices[i] + 1] * (r - i)
-				yield tuple(pool[i] for i in indices)
-
-		def combinations_with_replacement2(iterable, r):
-			'Alternate version that filters from product()'
-			pool = tuple(iterable)
-			n = len(pool)
-			for indices in product(range(n), repeat=r):
-				if sorted(indices) == list(indices):
-					yield tuple(pool[i] for i in indices)
+        def combinations_with_replacement(iterable, r):
+            "combinations_with_replacement('ABC', 2) --> AA AB AC BB BC CC"
+            # number items returned:  (n+r-1)! / r! / (n-1)!
+            pool = tuple(iterable)
+            n = len(pool)
+            indices = [0] * r
+            yield tuple(pool[i] for i in indices)
+            while 1:
+                for i in reversed(range(r)):
+                    if indices[i] != n - 1:
+                        break
+                else:
+                    return
+                indices[i:] = [indices[i] + 1] * (r - i)
+                yield tuple(pool[i] for i in indices)
+
+        def combinations_with_replacement2(iterable, r):
+            'Alternate version that filters from product()'
+            pool = tuple(iterable)
+            n = len(pool)
+            for indices in product(range(n), repeat=r):
+                if sorted(indices) == list(indices):
+                    yield tuple(pool[i] for i in indices)
 */
 typedef struct {
-	PyObject_HEAD
-	PyObject *pool;			/* input converted to a tuple */
-	Py_ssize_t *indices;    /* one index per result element */
-	PyObject *result;       /* most recently returned result tuple */
-	Py_ssize_t r;			/* size of result tuple */
-	int stopped;			/* set to 1 when the cwr iterator is exhausted */
+    PyObject_HEAD
+    PyObject *pool;                     /* input converted to a tuple */
+    Py_ssize_t *indices;    /* one index per result element */
+    PyObject *result;       /* most recently returned result tuple */
+    Py_ssize_t r;                       /* size of result tuple */
+    int stopped;                        /* set to 1 when the cwr iterator is exhausted */
 } cwrobject;
 
 static PyTypeObject cwr_type;
@@ -2288,156 +2288,156 @@ static PyTypeObject cwr_type;
 static PyObject *
 cwr_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	cwrobject *co;
-	Py_ssize_t n;
-	Py_ssize_t r;
-	PyObject *pool = NULL;
-	PyObject *iterable = NULL;
-	Py_ssize_t *indices = NULL;
-	Py_ssize_t i;
-	static char *kwargs[] = {"iterable", "r", NULL};
- 
- 	if (!PyArg_ParseTupleAndKeywords(args, kwds, "On:combinations_with_replacement", kwargs, 
-					 &iterable, &r))
-		return NULL;
-
-	pool = PySequence_Tuple(iterable);
-	if (pool == NULL)
-		goto error;
-	n = PyTuple_GET_SIZE(pool);
-	if (r < 0) {
-		PyErr_SetString(PyExc_ValueError, "r must be non-negative");
-		goto error;
-	}
-
-	indices = PyMem_Malloc(r * sizeof(Py_ssize_t));
-	if (indices == NULL) {
-    		PyErr_NoMemory();
-		goto error;
-	}
-
-	for (i=0 ; i<r ; i++)
-		indices[i] = 0;
-
-	/* create cwrobject structure */
-	co = (cwrobject *)type->tp_alloc(type, 0);
-	if (co == NULL)
-		goto error;
-
-	co->pool = pool;
-	co->indices = indices;
-	co->result = NULL;
-	co->r = r;
-	co->stopped = !n && r;
-
-	return (PyObject *)co;
+    cwrobject *co;
+    Py_ssize_t n;
+    Py_ssize_t r;
+    PyObject *pool = NULL;
+    PyObject *iterable = NULL;
+    Py_ssize_t *indices = NULL;
+    Py_ssize_t i;
+    static char *kwargs[] = {"iterable", "r", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "On:combinations_with_replacement", kwargs,
+                                     &iterable, &r))
+        return NULL;
+
+    pool = PySequence_Tuple(iterable);
+    if (pool == NULL)
+        goto error;
+    n = PyTuple_GET_SIZE(pool);
+    if (r < 0) {
+        PyErr_SetString(PyExc_ValueError, "r must be non-negative");
+        goto error;
+    }
+
+    indices = PyMem_Malloc(r * sizeof(Py_ssize_t));
+    if (indices == NULL) {
+        PyErr_NoMemory();
+        goto error;
+    }
+
+    for (i=0 ; i<r ; i++)
+        indices[i] = 0;
+
+    /* create cwrobject structure */
+    co = (cwrobject *)type->tp_alloc(type, 0);
+    if (co == NULL)
+        goto error;
+
+    co->pool = pool;
+    co->indices = indices;
+    co->result = NULL;
+    co->r = r;
+    co->stopped = !n && r;
+
+    return (PyObject *)co;
 
 error:
-	if (indices != NULL)
-		PyMem_Free(indices);
-	Py_XDECREF(pool);
-	return NULL;
+    if (indices != NULL)
+        PyMem_Free(indices);
+    Py_XDECREF(pool);
+    return NULL;
 }
 
 static void
 cwr_dealloc(cwrobject *co)
 {
-	PyObject_GC_UnTrack(co);
-	Py_XDECREF(co->pool);
-	Py_XDECREF(co->result);
-	if (co->indices != NULL)
-		PyMem_Free(co->indices);
-	Py_TYPE(co)->tp_free(co);
+    PyObject_GC_UnTrack(co);
+    Py_XDECREF(co->pool);
+    Py_XDECREF(co->result);
+    if (co->indices != NULL)
+        PyMem_Free(co->indices);
+    Py_TYPE(co)->tp_free(co);
 }
 
 static int
 cwr_traverse(cwrobject *co, visitproc visit, void *arg)
 {
-	Py_VISIT(co->pool);
-	Py_VISIT(co->result);
-	return 0;
+    Py_VISIT(co->pool);
+    Py_VISIT(co->result);
+    return 0;
 }
 
 static PyObject *
 cwr_next(cwrobject *co)
 {
-	PyObject *elem;
-	PyObject *oldelem;
-	PyObject *pool = co->pool;
-	Py_ssize_t *indices = co->indices;
-	PyObject *result = co->result;
-	Py_ssize_t n = PyTuple_GET_SIZE(pool);
-	Py_ssize_t r = co->r;
-	Py_ssize_t i, j, index;
-
-	if (co->stopped)
-		return NULL;
-
-	if (result == NULL) {
-                /* On the first pass, initialize result tuple using the indices */
-		result = PyTuple_New(r);
-		if (result == NULL)
-            		goto empty;
-		co->result = result;
-		for (i=0; i<r ; i++) {
-			index = indices[i];
-    			elem = PyTuple_GET_ITEM(pool, index);
-    			Py_INCREF(elem);
-    			PyTuple_SET_ITEM(result, i, elem);
-		}
-	} else {
-		/* Copy the previous result tuple or re-use it if available */
-		if (Py_REFCNT(result) > 1) {
-			PyObject *old_result = result;
-			result = PyTuple_New(r);
-			if (result == NULL)
-				goto empty;
-			co->result = result;
-			for (i=0; i<r ; i++) {
-				elem = PyTuple_GET_ITEM(old_result, i);
-    				Py_INCREF(elem);
-    				PyTuple_SET_ITEM(result, i, elem);
-			}
-			Py_DECREF(old_result);
-		}
-		/* Now, we've got the only copy so we can update it in-place CPython's
-		   empty tuple is a singleton and cached in PyTuple's freelist. */
-		assert(r == 0 || Py_REFCNT(result) == 1);
-
-        /* Scan indices right-to-left until finding one that is not
-         * at its maximum (n-1). */
-		for (i=r-1 ; i >= 0 && indices[i] == n-1; i--)
-			;
+    PyObject *elem;
+    PyObject *oldelem;
+    PyObject *pool = co->pool;
+    Py_ssize_t *indices = co->indices;
+    PyObject *result = co->result;
+    Py_ssize_t n = PyTuple_GET_SIZE(pool);
+    Py_ssize_t r = co->r;
+    Py_ssize_t i, j, index;
+
+    if (co->stopped)
+        return NULL;
+
+    if (result == NULL) {
+        /* On the first pass, initialize result tuple using the indices */
+        result = PyTuple_New(r);
+        if (result == NULL)
+            goto empty;
+        co->result = result;
+        for (i=0; i<r ; i++) {
+            index = indices[i];
+            elem = PyTuple_GET_ITEM(pool, index);
+            Py_INCREF(elem);
+            PyTuple_SET_ITEM(result, i, elem);
+        }
+    } else {
+        /* Copy the previous result tuple or re-use it if available */
+        if (Py_REFCNT(result) > 1) {
+            PyObject *old_result = result;
+            result = PyTuple_New(r);
+            if (result == NULL)
+                goto empty;
+            co->result = result;
+            for (i=0; i<r ; i++) {
+                elem = PyTuple_GET_ITEM(old_result, i);
+                Py_INCREF(elem);
+                PyTuple_SET_ITEM(result, i, elem);
+            }
+            Py_DECREF(old_result);
+        }
+        /* Now, we've got the only copy so we can update it in-place CPython's
+           empty tuple is a singleton and cached in PyTuple's freelist. */
+        assert(r == 0 || Py_REFCNT(result) == 1);
+
+    /* Scan indices right-to-left until finding one that is not
+     * at its maximum (n-1). */
+        for (i=r-1 ; i >= 0 && indices[i] == n-1; i--)
+            ;
+
+        /* If i is negative, then the indices are all at
+       their maximum value and we're done. */
+        if (i < 0)
+            goto empty;
+
+        /* Increment the current index which we know is not at its
+       maximum.  Then set all to the right to the same value. */
+        indices[i]++;
+        for (j=i+1 ; j<r ; j++)
+            indices[j] = indices[j-1];
+
+        /* Update the result tuple for the new indices
+           starting with i, the leftmost index that changed */
+        for ( ; i<r ; i++) {
+            index = indices[i];
+            elem = PyTuple_GET_ITEM(pool, index);
+            Py_INCREF(elem);
+            oldelem = PyTuple_GET_ITEM(result, i);
+            PyTuple_SET_ITEM(result, i, elem);
+            Py_DECREF(oldelem);
+        }
+    }
 
-		/* If i is negative, then the indices are all at
-           their maximum value and we're done. */
-		if (i < 0)
-			goto empty;
-
-		/* Increment the current index which we know is not at its
-           maximum.  Then set all to the right to the same value. */
-		indices[i]++;
-		for (j=i+1 ; j<r ; j++)
-			indices[j] = indices[j-1];
-
-		/* Update the result tuple for the new indices
-		   starting with i, the leftmost index that changed */
-		for ( ; i<r ; i++) {
-			index = indices[i];
-			elem = PyTuple_GET_ITEM(pool, index);
-			Py_INCREF(elem);
-			oldelem = PyTuple_GET_ITEM(result, i);
-			PyTuple_SET_ITEM(result, i, elem);
-			Py_DECREF(oldelem);
-		}
-	}
-
-	Py_INCREF(result);
-	return result;
+    Py_INCREF(result);
+    return result;
 
 empty:
-	co->stopped = 1;
-	return NULL;
+    co->stopped = 1;
+    return NULL;
 }
 
 PyDoc_STRVAR(cwr_doc,
@@ -2448,52 +2448,52 @@ allowing individual elements to have successive repeats.\n\
 combinations_with_replacement('ABC', 2) --> AA AB AC BB BC CC");
 
 static PyTypeObject cwr_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.combinations_with_replacement",		/* tp_name */
-	sizeof(cwrobject),		/* tp_basicsize */
-	0,						/* tp_itemsize */
-	/* methods */
-	(destructor)cwr_dealloc,	/* tp_dealloc */
-	0,						/* tp_print */
-	0,						/* tp_getattr */
-	0,						/* tp_setattr */
-	0,						/* tp_compare */
-	0,						/* tp_repr */
-	0,						/* tp_as_number */
-	0,						/* tp_as_sequence */
-	0,						/* tp_as_mapping */
-	0,						/* tp_hash */
-	0,						/* tp_call */
-	0,						/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,						/* tp_setattro */
-	0,						/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	cwr_doc,				/* tp_doc */
-	(traverseproc)cwr_traverse,	/* tp_traverse */
-	0,						/* tp_clear */
-	0,						/* tp_richcompare */
-	0,						/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)cwr_next,	/* tp_iternext */
-	0,						/* tp_methods */
-	0,						/* tp_members */
-	0,						/* tp_getset */
-	0,						/* tp_base */
-	0,						/* tp_dict */
-	0,						/* tp_descr_get */
-	0,						/* tp_descr_set */
-	0,						/* tp_dictoffset */
-	0,						/* tp_init */
-	0,						/* tp_alloc */
-	cwr_new,				/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.combinations_with_replacement",                  /* tp_name */
+    sizeof(cwrobject),                  /* tp_basicsize */
+    0,                                                  /* tp_itemsize */
+    /* methods */
+    (destructor)cwr_dealloc,            /* tp_dealloc */
+    0,                                                  /* tp_print */
+    0,                                                  /* tp_getattr */
+    0,                                                  /* tp_setattr */
+    0,                                                  /* tp_compare */
+    0,                                                  /* tp_repr */
+    0,                                                  /* tp_as_number */
+    0,                                                  /* tp_as_sequence */
+    0,                                                  /* tp_as_mapping */
+    0,                                                  /* tp_hash */
+    0,                                                  /* tp_call */
+    0,                                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                                  /* tp_setattro */
+    0,                                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    cwr_doc,                                    /* tp_doc */
+    (traverseproc)cwr_traverse,         /* tp_traverse */
+    0,                                                  /* tp_clear */
+    0,                                                  /* tp_richcompare */
+    0,                                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)cwr_next,     /* tp_iternext */
+    0,                                                  /* tp_methods */
+    0,                                                  /* tp_members */
+    0,                                                  /* tp_getset */
+    0,                                                  /* tp_base */
+    0,                                                  /* tp_dict */
+    0,                                                  /* tp_descr_get */
+    0,                                                  /* tp_descr_set */
+    0,                                                  /* tp_dictoffset */
+    0,                                                  /* tp_init */
+    0,                                                  /* tp_alloc */
+    cwr_new,                                    /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* permutations object ************************************************************
-  
+
 def permutations(iterable, r=None):
     'permutations(range(3), 2) --> (0,1) (0,2) (1,0) (1,2) (2,0) (2,1)'
     pool = tuple(iterable)
@@ -2503,28 +2503,28 @@ def permutations(iterable, r=None):
     cycles = range(n-r+1, n+1)[::-1]
     yield tuple(pool[i] for i in indices[:r])
     while n:
-        for i in reversed(range(r)):
-            cycles[i] -= 1
-            if cycles[i] == 0:
-                indices[i:] = indices[i+1:] + indices[i:i+1]
-                cycles[i] = n - i
-            else:
-                j = cycles[i]
-                indices[i], indices[-j] = indices[-j], indices[i]
-                yield tuple(pool[i] for i in indices[:r])
-                break
+    for i in reversed(range(r)):
+        cycles[i] -= 1
+        if cycles[i] == 0:
+        indices[i:] = indices[i+1:] + indices[i:i+1]
+        cycles[i] = n - i
         else:
-            return
+        j = cycles[i]
+        indices[i], indices[-j] = indices[-j], indices[i]
+        yield tuple(pool[i] for i in indices[:r])
+        break
+    else:
+        return
 */
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *pool;			/* input converted to a tuple */
-	Py_ssize_t *indices;            /* one index per element in the pool */
-	Py_ssize_t *cycles;		/* one rollover counter per element in the result */
-	PyObject *result;               /* most recently returned result tuple */
-	Py_ssize_t r;			/* size of result tuple */
-	int stopped;			/* set to 1 when the permutations iterator is exhausted */
+    PyObject_HEAD
+    PyObject *pool;                     /* input converted to a tuple */
+    Py_ssize_t *indices;            /* one index per element in the pool */
+    Py_ssize_t *cycles;                 /* one rollover counter per element in the result */
+    PyObject *result;               /* most recently returned result tuple */
+    Py_ssize_t r;                       /* size of result tuple */
+    int stopped;                        /* set to 1 when the permutations iterator is exhausted */
 } permutationsobject;
 
 static PyTypeObject permutations_type;
@@ -2532,180 +2532,180 @@ static PyTypeObject permutations_type;
 static PyObject *
 permutations_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	permutationsobject *po;
-	Py_ssize_t n;
-	Py_ssize_t r;
-	PyObject *robj = Py_None;
-	PyObject *pool = NULL;
-	PyObject *iterable = NULL;
-	Py_ssize_t *indices = NULL;
-	Py_ssize_t *cycles = NULL;
-	Py_ssize_t i;
-	static char *kwargs[] = {"iterable", "r", NULL};
- 
-	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:permutations", kwargs, 
-					 &iterable, &robj))
-		return NULL;
-
-	pool = PySequence_Tuple(iterable);
-	if (pool == NULL)
-		goto error;
-	n = PyTuple_GET_SIZE(pool);
-
-	r = n;
-	if (robj != Py_None) {
-		r = PyInt_AsSsize_t(robj);
-		if (r == -1 && PyErr_Occurred())
-			goto error;
-	}
-	if (r < 0) {
-		PyErr_SetString(PyExc_ValueError, "r must be non-negative");
-		goto error;
-	}
-
-	indices = PyMem_Malloc(n * sizeof(Py_ssize_t));
-	cycles = PyMem_Malloc(r * sizeof(Py_ssize_t));
-	if (indices == NULL || cycles == NULL) {
-    		PyErr_NoMemory();
-		goto error;
-	}
-
-	for (i=0 ; i<n ; i++)
-		indices[i] = i;
-	for (i=0 ; i<r ; i++)
-		cycles[i] = n - i;
-
-	/* create permutationsobject structure */
-	po = (permutationsobject *)type->tp_alloc(type, 0);
-	if (po == NULL)
-		goto error;
-
-	po->pool = pool;
-	po->indices = indices;
-	po->cycles = cycles;
-	po->result = NULL;
-	po->r = r;
-	po->stopped = r > n ? 1 : 0;
-
-	return (PyObject *)po;
+    permutationsobject *po;
+    Py_ssize_t n;
+    Py_ssize_t r;
+    PyObject *robj = Py_None;
+    PyObject *pool = NULL;
+    PyObject *iterable = NULL;
+    Py_ssize_t *indices = NULL;
+    Py_ssize_t *cycles = NULL;
+    Py_ssize_t i;
+    static char *kwargs[] = {"iterable", "r", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:permutations", kwargs,
+                                     &iterable, &robj))
+        return NULL;
+
+    pool = PySequence_Tuple(iterable);
+    if (pool == NULL)
+        goto error;
+    n = PyTuple_GET_SIZE(pool);
+
+    r = n;
+    if (robj != Py_None) {
+        r = PyInt_AsSsize_t(robj);
+        if (r == -1 && PyErr_Occurred())
+            goto error;
+    }
+    if (r < 0) {
+        PyErr_SetString(PyExc_ValueError, "r must be non-negative");
+        goto error;
+    }
+
+    indices = PyMem_Malloc(n * sizeof(Py_ssize_t));
+    cycles = PyMem_Malloc(r * sizeof(Py_ssize_t));
+    if (indices == NULL || cycles == NULL) {
+        PyErr_NoMemory();
+        goto error;
+    }
+
+    for (i=0 ; i<n ; i++)
+        indices[i] = i;
+    for (i=0 ; i<r ; i++)
+        cycles[i] = n - i;
+
+    /* create permutationsobject structure */
+    po = (permutationsobject *)type->tp_alloc(type, 0);
+    if (po == NULL)
+        goto error;
+
+    po->pool = pool;
+    po->indices = indices;
+    po->cycles = cycles;
+    po->result = NULL;
+    po->r = r;
+    po->stopped = r > n ? 1 : 0;
+
+    return (PyObject *)po;
 
 error:
-	if (indices != NULL)
-		PyMem_Free(indices);
-	if (cycles != NULL)
-		PyMem_Free(cycles);
-	Py_XDECREF(pool);
-	return NULL;
+    if (indices != NULL)
+        PyMem_Free(indices);
+    if (cycles != NULL)
+        PyMem_Free(cycles);
+    Py_XDECREF(pool);
+    return NULL;
 }
 
 static void
 permutations_dealloc(permutationsobject *po)
 {
-	PyObject_GC_UnTrack(po);
-	Py_XDECREF(po->pool);
-	Py_XDECREF(po->result);
-	PyMem_Free(po->indices);
-	PyMem_Free(po->cycles);
-	Py_TYPE(po)->tp_free(po);
+    PyObject_GC_UnTrack(po);
+    Py_XDECREF(po->pool);
+    Py_XDECREF(po->result);
+    PyMem_Free(po->indices);
+    PyMem_Free(po->cycles);
+    Py_TYPE(po)->tp_free(po);
 }
 
 static int
 permutations_traverse(permutationsobject *po, visitproc visit, void *arg)
 {
-	Py_VISIT(po->pool);
-	Py_VISIT(po->result);
-	return 0;
+    Py_VISIT(po->pool);
+    Py_VISIT(po->result);
+    return 0;
 }
 
 static PyObject *
 permutations_next(permutationsobject *po)
 {
-	PyObject *elem;
-	PyObject *oldelem;
-	PyObject *pool = po->pool;
-	Py_ssize_t *indices = po->indices;
-	Py_ssize_t *cycles = po->cycles;
-	PyObject *result = po->result;
-	Py_ssize_t n = PyTuple_GET_SIZE(pool);
-	Py_ssize_t r = po->r;
-	Py_ssize_t i, j, k, index;
-
-	if (po->stopped)
-		return NULL;
-
-	if (result == NULL) {
-                /* On the first pass, initialize result tuple using the indices */
-		result = PyTuple_New(r);
-		if (result == NULL)
-            		goto empty;
-		po->result = result;
-		for (i=0; i<r ; i++) {
-			index = indices[i];
-    			elem = PyTuple_GET_ITEM(pool, index);
-    			Py_INCREF(elem);
-    			PyTuple_SET_ITEM(result, i, elem);
-		}
-	} else {
-		if (n == 0)
-			goto empty;
-
-		/* Copy the previous result tuple or re-use it if available */
-		if (Py_REFCNT(result) > 1) {
-			PyObject *old_result = result;
-			result = PyTuple_New(r);
-			if (result == NULL)
-				goto empty;
-			po->result = result;
-			for (i=0; i<r ; i++) {
-				elem = PyTuple_GET_ITEM(old_result, i);
-    				Py_INCREF(elem);
-    				PyTuple_SET_ITEM(result, i, elem);
-			}
-			Py_DECREF(old_result);
-		}
-		/* Now, we've got the only copy so we can update it in-place */
-		assert(r == 0 || Py_REFCNT(result) == 1);
-
-                /* Decrement rightmost cycle, moving leftward upon zero rollover */
-		for (i=r-1 ; i>=0 ; i--) {
-			cycles[i] -= 1;
-			if (cycles[i] == 0) {
-				/* rotatation: indices[i:] = indices[i+1:] + indices[i:i+1] */
-				index = indices[i];
-				for (j=i ; j<n-1 ; j++)
-					indices[j] = indices[j+1];
-				indices[n-1] = index;
-				cycles[i] = n - i;
-			} else {
-				j = cycles[i];
-				index = indices[i];
-				indices[i] = indices[n-j];
-				indices[n-j] = index;
-
-				for (k=i; k<r ; k++) {
-					/* start with i, the leftmost element that changed */
-					/* yield tuple(pool[k] for k in indices[:r]) */
-					index = indices[k];
-					elem = PyTuple_GET_ITEM(pool, index);
-    					Py_INCREF(elem);
-					oldelem = PyTuple_GET_ITEM(result, k);
-    					PyTuple_SET_ITEM(result, k, elem);
-					Py_DECREF(oldelem);
-				}
-				break;
-			}
-		}
-		/* If i is negative, then the cycles have all
-                   rolled-over and we're done. */
-		if (i < 0)
-			goto empty;
-	}
-	Py_INCREF(result);
-	return result;
+    PyObject *elem;
+    PyObject *oldelem;
+    PyObject *pool = po->pool;
+    Py_ssize_t *indices = po->indices;
+    Py_ssize_t *cycles = po->cycles;
+    PyObject *result = po->result;
+    Py_ssize_t n = PyTuple_GET_SIZE(pool);
+    Py_ssize_t r = po->r;
+    Py_ssize_t i, j, k, index;
+
+    if (po->stopped)
+        return NULL;
+
+    if (result == NULL) {
+        /* On the first pass, initialize result tuple using the indices */
+        result = PyTuple_New(r);
+        if (result == NULL)
+            goto empty;
+        po->result = result;
+        for (i=0; i<r ; i++) {
+            index = indices[i];
+            elem = PyTuple_GET_ITEM(pool, index);
+            Py_INCREF(elem);
+            PyTuple_SET_ITEM(result, i, elem);
+        }
+    } else {
+        if (n == 0)
+            goto empty;
+
+        /* Copy the previous result tuple or re-use it if available */
+        if (Py_REFCNT(result) > 1) {
+            PyObject *old_result = result;
+            result = PyTuple_New(r);
+            if (result == NULL)
+                goto empty;
+            po->result = result;
+            for (i=0; i<r ; i++) {
+                elem = PyTuple_GET_ITEM(old_result, i);
+                Py_INCREF(elem);
+                PyTuple_SET_ITEM(result, i, elem);
+            }
+            Py_DECREF(old_result);
+        }
+        /* Now, we've got the only copy so we can update it in-place */
+        assert(r == 0 || Py_REFCNT(result) == 1);
+
+        /* Decrement rightmost cycle, moving leftward upon zero rollover */
+        for (i=r-1 ; i>=0 ; i--) {
+            cycles[i] -= 1;
+            if (cycles[i] == 0) {
+                /* rotatation: indices[i:] = indices[i+1:] + indices[i:i+1] */
+                index = indices[i];
+                for (j=i ; j<n-1 ; j++)
+                    indices[j] = indices[j+1];
+                indices[n-1] = index;
+                cycles[i] = n - i;
+            } else {
+                j = cycles[i];
+                index = indices[i];
+                indices[i] = indices[n-j];
+                indices[n-j] = index;
+
+                for (k=i; k<r ; k++) {
+                    /* start with i, the leftmost element that changed */
+                    /* yield tuple(pool[k] for k in indices[:r]) */
+                    index = indices[k];
+                    elem = PyTuple_GET_ITEM(pool, index);
+                    Py_INCREF(elem);
+                    oldelem = PyTuple_GET_ITEM(result, k);
+                    PyTuple_SET_ITEM(result, k, elem);
+                    Py_DECREF(oldelem);
+                }
+                break;
+            }
+        }
+        /* If i is negative, then the cycles have all
+           rolled-over and we're done. */
+        if (i < 0)
+            goto empty;
+    }
+    Py_INCREF(result);
+    return result;
 
 empty:
-	po->stopped = 1;
-	return NULL;
+    po->stopped = 1;
+    return NULL;
 }
 
 PyDoc_STRVAR(permutations_doc,
@@ -2715,47 +2715,47 @@ Return successive r-length permutations of elements in the iterable.\n\n\
 permutations(range(3), 2) --> (0,1), (0,2), (1,0), (1,2), (2,0), (2,1)");
 
 static PyTypeObject permutations_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.permutations",		/* tp_name */
-	sizeof(permutationsobject),	/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)permutations_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	permutations_doc,			/* tp_doc */
-	(traverseproc)permutations_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)permutations_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	permutations_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.permutations",                   /* tp_name */
+    sizeof(permutationsobject),         /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)permutations_dealloc,           /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    permutations_doc,                           /* tp_doc */
+    (traverseproc)permutations_traverse,        /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)permutations_next,            /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    permutations_new,                           /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
@@ -2763,15 +2763,15 @@ static PyTypeObject permutations_type = {
 
 /* Equivalent to:
 
-	def compress(data, selectors):
-		"compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F"
-		return (d for d, s in izip(data, selectors) if s)
+    def compress(data, selectors):
+        "compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F"
+        return (d for d, s in izip(data, selectors) if s)
 */
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *data;
-	PyObject *selectors;
+    PyObject_HEAD
+    PyObject *data;
+    PyObject *selectors;
 } compressobject;
 
 static PyTypeObject compress_type;
@@ -2779,86 +2779,86 @@ static PyTypeObject compress_type;
 static PyObject *
 compress_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *seq1, *seq2;
-	PyObject *data=NULL, *selectors=NULL;
-	compressobject *lz;
-	static char *kwargs[] = {"data", "selectors", NULL};
- 
- 	if (!PyArg_ParseTupleAndKeywords(args, kwds, "OO:compress", kwargs, &seq1, &seq2))
-		return NULL;
-
-	data = PyObject_GetIter(seq1);
-	if (data == NULL)
-		goto fail;
-	selectors = PyObject_GetIter(seq2);
-	if (selectors == NULL)
-		goto fail;
-
-	/* create compressobject structure */
-	lz = (compressobject *)type->tp_alloc(type, 0);
-	if (lz == NULL)
-		goto fail;
-	lz->data = data;
-	lz->selectors = selectors;
-	return (PyObject *)lz;
+    PyObject *seq1, *seq2;
+    PyObject *data=NULL, *selectors=NULL;
+    compressobject *lz;
+    static char *kwargs[] = {"data", "selectors", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "OO:compress", kwargs, &seq1, &seq2))
+        return NULL;
+
+    data = PyObject_GetIter(seq1);
+    if (data == NULL)
+        goto fail;
+    selectors = PyObject_GetIter(seq2);
+    if (selectors == NULL)
+        goto fail;
+
+    /* create compressobject structure */
+    lz = (compressobject *)type->tp_alloc(type, 0);
+    if (lz == NULL)
+        goto fail;
+    lz->data = data;
+    lz->selectors = selectors;
+    return (PyObject *)lz;
 
 fail:
-	Py_XDECREF(data);
-	Py_XDECREF(selectors);
-	return NULL;
+    Py_XDECREF(data);
+    Py_XDECREF(selectors);
+    return NULL;
 }
 
 static void
 compress_dealloc(compressobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->data);
-	Py_XDECREF(lz->selectors);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->data);
+    Py_XDECREF(lz->selectors);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 compress_traverse(compressobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->data);
-	Py_VISIT(lz->selectors);
-	return 0;
+    Py_VISIT(lz->data);
+    Py_VISIT(lz->selectors);
+    return 0;
 }
 
 static PyObject *
 compress_next(compressobject *lz)
 {
-	PyObject *data = lz->data, *selectors = lz->selectors;
-	PyObject *datum, *selector;
-	PyObject *(*datanext)(PyObject *) = *Py_TYPE(data)->tp_iternext;
-	PyObject *(*selectornext)(PyObject *) = *Py_TYPE(selectors)->tp_iternext;
-	int ok;
-
-	while (1) {
-		/* Steps:  get datum, get selector, evaluate selector.
-		   Order is important (to match the pure python version
-		   in terms of which input gets a chance to raise an
-		   exception first).
-		*/
-
-		datum = datanext(data);
-		if (datum == NULL)
-			return NULL;
-
-		selector = selectornext(selectors);
-		if (selector == NULL) {
-			Py_DECREF(datum);
-			return NULL;
-		}
-
-		ok = PyObject_IsTrue(selector);
-		Py_DECREF(selector);
-		if (ok == 1)
-			return datum;
-		Py_DECREF(datum);
-		if (ok == -1)
-			return NULL;
-	}
+    PyObject *data = lz->data, *selectors = lz->selectors;
+    PyObject *datum, *selector;
+    PyObject *(*datanext)(PyObject *) = *Py_TYPE(data)->tp_iternext;
+    PyObject *(*selectornext)(PyObject *) = *Py_TYPE(selectors)->tp_iternext;
+    int ok;
+
+    while (1) {
+        /* Steps:  get datum, get selector, evaluate selector.
+           Order is important (to match the pure python version
+           in terms of which input gets a chance to raise an
+           exception first).
+        */
+
+        datum = datanext(data);
+        if (datum == NULL)
+            return NULL;
+
+        selector = selectornext(selectors);
+        if (selector == NULL) {
+            Py_DECREF(datum);
+            return NULL;
+        }
+
+        ok = PyObject_IsTrue(selector);
+        Py_DECREF(selector);
+        if (ok == 1)
+            return datum;
+        Py_DECREF(datum);
+        if (ok == -1)
+            return NULL;
+    }
 }
 
 PyDoc_STRVAR(compress_doc,
@@ -2869,56 +2869,56 @@ Forms a shorter iterator from selected data elements using the\n\
 selectors to choose the data elements.");
 
 static PyTypeObject compress_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.compress",		/* tp_name */
-	sizeof(compressobject),		/* tp_basicsize */
-	0,							/* tp_itemsize */
-	/* methods */
-	(destructor)compress_dealloc,	/* tp_dealloc */
-	0,								/* tp_print */
-	0,								/* tp_getattr */
-	0,								/* tp_setattr */
-	0,								/* tp_compare */
-	0,								/* tp_repr */
-	0,								/* tp_as_number */
-	0,								/* tp_as_sequence */
-	0,								/* tp_as_mapping */
-	0,								/* tp_hash */
-	0,								/* tp_call */
-	0,								/* tp_str */
-	PyObject_GenericGetAttr,		/* tp_getattro */
-	0,								/* tp_setattro */
-	0,								/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,		/* tp_flags */
-	compress_doc,					/* tp_doc */
-	(traverseproc)compress_traverse,	/* tp_traverse */
-	0,								/* tp_clear */
-	0,								/* tp_richcompare */
-	0,								/* tp_weaklistoffset */
-	PyObject_SelfIter,				/* tp_iter */
-	(iternextfunc)compress_next,	/* tp_iternext */
-	0,								/* tp_methods */
-	0,								/* tp_members */
-	0,								/* tp_getset */
-	0,								/* tp_base */
-	0,								/* tp_dict */
-	0,								/* tp_descr_get */
-	0,								/* tp_descr_set */
-	0,								/* tp_dictoffset */
-	0,								/* tp_init */
-	0,								/* tp_alloc */
-	compress_new,					/* tp_new */
-	PyObject_GC_Del,				/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.compress",               /* tp_name */
+    sizeof(compressobject),             /* tp_basicsize */
+    0,                                                          /* tp_itemsize */
+    /* methods */
+    (destructor)compress_dealloc,       /* tp_dealloc */
+    0,                                                                  /* tp_print */
+    0,                                                                  /* tp_getattr */
+    0,                                                                  /* tp_setattr */
+    0,                                                                  /* tp_compare */
+    0,                                                                  /* tp_repr */
+    0,                                                                  /* tp_as_number */
+    0,                                                                  /* tp_as_sequence */
+    0,                                                                  /* tp_as_mapping */
+    0,                                                                  /* tp_hash */
+    0,                                                                  /* tp_call */
+    0,                                                                  /* tp_str */
+    PyObject_GenericGetAttr,                    /* tp_getattro */
+    0,                                                                  /* tp_setattro */
+    0,                                                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,                    /* tp_flags */
+    compress_doc,                                       /* tp_doc */
+    (traverseproc)compress_traverse,            /* tp_traverse */
+    0,                                                                  /* tp_clear */
+    0,                                                                  /* tp_richcompare */
+    0,                                                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                                  /* tp_iter */
+    (iternextfunc)compress_next,        /* tp_iternext */
+    0,                                                                  /* tp_methods */
+    0,                                                                  /* tp_members */
+    0,                                                                  /* tp_getset */
+    0,                                                                  /* tp_base */
+    0,                                                                  /* tp_dict */
+    0,                                                                  /* tp_descr_get */
+    0,                                                                  /* tp_descr_set */
+    0,                                                                  /* tp_dictoffset */
+    0,                                                                  /* tp_init */
+    0,                                                                  /* tp_alloc */
+    compress_new,                                       /* tp_new */
+    PyObject_GC_Del,                                    /* tp_free */
 };
 
 
 /* ifilter object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *func;
-	PyObject *it;
+    PyObject_HEAD
+    PyObject *func;
+    PyObject *it;
 } ifilterobject;
 
 static PyTypeObject ifilter_type;
@@ -2926,82 +2926,82 @@ static PyTypeObject ifilter_type;
 static PyObject *
 ifilter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *func, *seq;
-	PyObject *it;
-	ifilterobject *lz;
-
-	if (type == &ifilter_type && !_PyArg_NoKeywords("ifilter()", kwds))
-		return NULL;
-
-	if (!PyArg_UnpackTuple(args, "ifilter", 2, 2, &func, &seq))
-		return NULL;
-
-	/* Get iterator. */
-	it = PyObject_GetIter(seq);
-	if (it == NULL)
-		return NULL;
-
-	/* create ifilterobject structure */
-	lz = (ifilterobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(it);
-		return NULL;
-	}
-	Py_INCREF(func);
-	lz->func = func;
-	lz->it = it;
-
-	return (PyObject *)lz;
+    PyObject *func, *seq;
+    PyObject *it;
+    ifilterobject *lz;
+
+    if (type == &ifilter_type && !_PyArg_NoKeywords("ifilter()", kwds))
+        return NULL;
+
+    if (!PyArg_UnpackTuple(args, "ifilter", 2, 2, &func, &seq))
+        return NULL;
+
+    /* Get iterator. */
+    it = PyObject_GetIter(seq);
+    if (it == NULL)
+        return NULL;
+
+    /* create ifilterobject structure */
+    lz = (ifilterobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(it);
+        return NULL;
+    }
+    Py_INCREF(func);
+    lz->func = func;
+    lz->it = it;
+
+    return (PyObject *)lz;
 }
 
 static void
 ifilter_dealloc(ifilterobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->func);
-	Py_XDECREF(lz->it);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->func);
+    Py_XDECREF(lz->it);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 ifilter_traverse(ifilterobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->it);
-	Py_VISIT(lz->func);
-	return 0;
+    Py_VISIT(lz->it);
+    Py_VISIT(lz->func);
+    return 0;
 }
 
 static PyObject *
 ifilter_next(ifilterobject *lz)
 {
-	PyObject *item;
-	PyObject *it = lz->it;
-	long ok;
-	PyObject *(*iternext)(PyObject *);
-
-	iternext = *Py_TYPE(it)->tp_iternext;
-	for (;;) {
-		item = iternext(it);
-		if (item == NULL)
-			return NULL;
-
-		if (lz->func == Py_None || lz->func == (PyObject *)&PyBool_Type) {
-			ok = PyObject_IsTrue(item);
-		} else {
-			PyObject *good;
-			good = PyObject_CallFunctionObjArgs(lz->func,
-							    item, NULL);
-			if (good == NULL) {
-				Py_DECREF(item);
-				return NULL;
-			}
-			ok = PyObject_IsTrue(good);
-			Py_DECREF(good);
-		}
-		if (ok)
-			return item;
-		Py_DECREF(item);
-	}
+    PyObject *item;
+    PyObject *it = lz->it;
+    long ok;
+    PyObject *(*iternext)(PyObject *);
+
+    iternext = *Py_TYPE(it)->tp_iternext;
+    for (;;) {
+        item = iternext(it);
+        if (item == NULL)
+            return NULL;
+
+        if (lz->func == Py_None || lz->func == (PyObject *)&PyBool_Type) {
+            ok = PyObject_IsTrue(item);
+        } else {
+            PyObject *good;
+            good = PyObject_CallFunctionObjArgs(lz->func,
+                                                item, NULL);
+            if (good == NULL) {
+                Py_DECREF(item);
+                return NULL;
+            }
+            ok = PyObject_IsTrue(good);
+            Py_DECREF(good);
+        }
+        if (ok)
+            return item;
+        Py_DECREF(item);
+    }
 }
 
 PyDoc_STRVAR(ifilter_doc,
@@ -3011,56 +3011,56 @@ Return those items of sequence for which function(item) is true.\n\
 If function is None, return the items that are true.");
 
 static PyTypeObject ifilter_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.ifilter",		/* tp_name */
-	sizeof(ifilterobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)ifilter_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	ifilter_doc,			/* tp_doc */
-	(traverseproc)ifilter_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)ifilter_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	ifilter_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.ifilter",                /* tp_name */
+    sizeof(ifilterobject),              /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)ifilter_dealloc,        /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    ifilter_doc,                        /* tp_doc */
+    (traverseproc)ifilter_traverse,     /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)ifilter_next,         /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    ifilter_new,                        /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* ifilterfalse object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *func;
-	PyObject *it;
+    PyObject_HEAD
+    PyObject *func;
+    PyObject *it;
 } ifilterfalseobject;
 
 static PyTypeObject ifilterfalse_type;
@@ -3068,83 +3068,83 @@ static PyTypeObject ifilterfalse_type;
 static PyObject *
 ifilterfalse_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	PyObject *func, *seq;
-	PyObject *it;
-	ifilterfalseobject *lz;
-
-	if (type == &ifilterfalse_type &&
-	    !_PyArg_NoKeywords("ifilterfalse()", kwds))
-		return NULL;
-
-	if (!PyArg_UnpackTuple(args, "ifilterfalse", 2, 2, &func, &seq))
-		return NULL;
-
-	/* Get iterator. */
-	it = PyObject_GetIter(seq);
-	if (it == NULL)
-		return NULL;
-
-	/* create ifilterfalseobject structure */
-	lz = (ifilterfalseobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(it);
-		return NULL;
-	}
-	Py_INCREF(func);
-	lz->func = func;
-	lz->it = it;
-
-	return (PyObject *)lz;
+    PyObject *func, *seq;
+    PyObject *it;
+    ifilterfalseobject *lz;
+
+    if (type == &ifilterfalse_type &&
+        !_PyArg_NoKeywords("ifilterfalse()", kwds))
+        return NULL;
+
+    if (!PyArg_UnpackTuple(args, "ifilterfalse", 2, 2, &func, &seq))
+        return NULL;
+
+    /* Get iterator. */
+    it = PyObject_GetIter(seq);
+    if (it == NULL)
+        return NULL;
+
+    /* create ifilterfalseobject structure */
+    lz = (ifilterfalseobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(it);
+        return NULL;
+    }
+    Py_INCREF(func);
+    lz->func = func;
+    lz->it = it;
+
+    return (PyObject *)lz;
 }
 
 static void
 ifilterfalse_dealloc(ifilterfalseobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->func);
-	Py_XDECREF(lz->it);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->func);
+    Py_XDECREF(lz->it);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 ifilterfalse_traverse(ifilterfalseobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->it);
-	Py_VISIT(lz->func);
-	return 0;
+    Py_VISIT(lz->it);
+    Py_VISIT(lz->func);
+    return 0;
 }
 
 static PyObject *
 ifilterfalse_next(ifilterfalseobject *lz)
 {
-	PyObject *item;
-	PyObject *it = lz->it;
-	long ok;
-	PyObject *(*iternext)(PyObject *);
-
-	iternext = *Py_TYPE(it)->tp_iternext;
-	for (;;) {
-		item = iternext(it);
-		if (item == NULL)
-			return NULL;
-
-		if (lz->func == Py_None || lz->func == (PyObject *)&PyBool_Type) {
-			ok = PyObject_IsTrue(item);
-		} else {
-			PyObject *good;
-			good = PyObject_CallFunctionObjArgs(lz->func,
-							    item, NULL);
-			if (good == NULL) {
-				Py_DECREF(item);
-				return NULL;
-			}
-			ok = PyObject_IsTrue(good);
-			Py_DECREF(good);
-		}
-		if (!ok)
-			return item;
-		Py_DECREF(item);
-	}
+    PyObject *item;
+    PyObject *it = lz->it;
+    long ok;
+    PyObject *(*iternext)(PyObject *);
+
+    iternext = *Py_TYPE(it)->tp_iternext;
+    for (;;) {
+        item = iternext(it);
+        if (item == NULL)
+            return NULL;
+
+        if (lz->func == Py_None || lz->func == (PyObject *)&PyBool_Type) {
+            ok = PyObject_IsTrue(item);
+        } else {
+            PyObject *good;
+            good = PyObject_CallFunctionObjArgs(lz->func,
+                                                item, NULL);
+            if (good == NULL) {
+                Py_DECREF(item);
+                return NULL;
+            }
+            ok = PyObject_IsTrue(good);
+            Py_DECREF(good);
+        }
+        if (!ok)
+            return item;
+        Py_DECREF(item);
+    }
 }
 
 PyDoc_STRVAR(ifilterfalse_doc,
@@ -3154,74 +3154,74 @@ Return those items of sequence for which function(item) is false.\n\
 If function is None, return the items that are false.");
 
 static PyTypeObject ifilterfalse_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.ifilterfalse",	/* tp_name */
-	sizeof(ifilterfalseobject),	/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)ifilterfalse_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	ifilterfalse_doc,		/* tp_doc */
-	(traverseproc)ifilterfalse_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)ifilterfalse_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	ifilterfalse_new,		/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.ifilterfalse",           /* tp_name */
+    sizeof(ifilterfalseobject),         /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)ifilterfalse_dealloc,           /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    ifilterfalse_doc,                   /* tp_doc */
+    (traverseproc)ifilterfalse_traverse,        /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)ifilterfalse_next,            /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    ifilterfalse_new,                   /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* count object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	Py_ssize_t cnt;
-	PyObject *long_cnt;
-	PyObject *long_step;
+    PyObject_HEAD
+    Py_ssize_t cnt;
+    PyObject *long_cnt;
+    PyObject *long_step;
 } countobject;
 
 /* Counting logic and invariants:
 
 fast_mode:  when cnt an integer < PY_SSIZE_T_MAX and no step is specified.
 
-	assert(cnt != PY_SSIZE_T_MAX && long_cnt == NULL && long_step==PyInt(1));
-	Advances with:  cnt += 1
-	When count hits Y_SSIZE_T_MAX, switch to slow_mode.
+    assert(cnt != PY_SSIZE_T_MAX && long_cnt == NULL && long_step==PyInt(1));
+    Advances with:  cnt += 1
+    When count hits Y_SSIZE_T_MAX, switch to slow_mode.
 
 slow_mode:  when cnt == PY_SSIZE_T_MAX, step is not int(1), or cnt is a float.
 
-	assert(cnt == PY_SSIZE_T_MAX && long_cnt != NULL && long_step != NULL);
-	All counting is done with python objects (no overflows or underflows).
-	Advances with:  long_cnt += long_step
-	Step may be zero -- effectively a slow version of repeat(cnt).
-	Either long_cnt or long_step may be a float, Fraction, or Decimal.
+    assert(cnt == PY_SSIZE_T_MAX && long_cnt != NULL && long_step != NULL);
+    All counting is done with python objects (no overflows or underflows).
+    Advances with:  long_cnt += long_step
+    Step may be zero -- effectively a slow version of repeat(cnt).
+    Either long_cnt or long_step may be a float, Fraction, or Decimal.
 */
 
 static PyTypeObject count_type;
@@ -3229,221 +3229,221 @@ static PyTypeObject count_type;
 static PyObject *
 count_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	countobject *lz;
-	int slow_mode = 0;
-	Py_ssize_t cnt = 0;
-	PyObject *long_cnt = NULL;
-	PyObject *long_step = NULL;
-	static char *kwlist[] = {"start", "step", 0};
-
-	if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OO:count",
-			kwlist, &long_cnt, &long_step))
-		return NULL;
-
-	if ((long_cnt != NULL && !PyNumber_Check(long_cnt)) ||
-            (long_step != NULL && !PyNumber_Check(long_step))) {
-			PyErr_SetString(PyExc_TypeError, "a number is required");
-			return NULL;
-	}
-
-	if (long_cnt != NULL) {
-		cnt = PyInt_AsSsize_t(long_cnt);
-		if ((cnt == -1 && PyErr_Occurred()) || !PyInt_Check(long_cnt)) {
-			PyErr_Clear();
-			slow_mode = 1;
-		}
-		Py_INCREF(long_cnt);
-	} else {
-		cnt = 0;
-		long_cnt = PyInt_FromLong(0);
-	}
-
-	/* If not specified, step defaults to 1 */
-	if (long_step == NULL) {
-		long_step = PyInt_FromLong(1);
-		if (long_step == NULL) {
-			Py_DECREF(long_cnt);
-			return NULL;
-		}
-	} else
-		Py_INCREF(long_step);
-
-	assert(long_cnt != NULL && long_step != NULL);
-
-	/* Fast mode only works when the step is 1 */
-	if (!PyInt_Check(long_step) ||
-		PyInt_AS_LONG(long_step) != 1) {
-			slow_mode = 1;
-	}
-
-	if (slow_mode)
-		cnt = PY_SSIZE_T_MAX;
-	else
-		Py_CLEAR(long_cnt);
-
-	assert((cnt != PY_SSIZE_T_MAX && long_cnt == NULL && !slow_mode) ||
-               (cnt == PY_SSIZE_T_MAX && long_cnt != NULL && slow_mode));
-	assert(slow_mode || 
-               (PyInt_Check(long_step) && PyInt_AS_LONG(long_step) == 1));
-
-	/* create countobject structure */
-	lz = (countobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_XDECREF(long_cnt);
-		return NULL;
-	}
-	lz->cnt = cnt;
-	lz->long_cnt = long_cnt;
-	lz->long_step = long_step;
-
-	return (PyObject *)lz;
+    countobject *lz;
+    int slow_mode = 0;
+    Py_ssize_t cnt = 0;
+    PyObject *long_cnt = NULL;
+    PyObject *long_step = NULL;
+    static char *kwlist[] = {"start", "step", 0};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OO:count",
+                    kwlist, &long_cnt, &long_step))
+        return NULL;
+
+    if ((long_cnt != NULL && !PyNumber_Check(long_cnt)) ||
+        (long_step != NULL && !PyNumber_Check(long_step))) {
+                    PyErr_SetString(PyExc_TypeError, "a number is required");
+                    return NULL;
+    }
+
+    if (long_cnt != NULL) {
+        cnt = PyInt_AsSsize_t(long_cnt);
+        if ((cnt == -1 && PyErr_Occurred()) || !PyInt_Check(long_cnt)) {
+            PyErr_Clear();
+            slow_mode = 1;
+        }
+        Py_INCREF(long_cnt);
+    } else {
+        cnt = 0;
+        long_cnt = PyInt_FromLong(0);
+    }
+
+    /* If not specified, step defaults to 1 */
+    if (long_step == NULL) {
+        long_step = PyInt_FromLong(1);
+        if (long_step == NULL) {
+            Py_DECREF(long_cnt);
+            return NULL;
+        }
+    } else
+        Py_INCREF(long_step);
+
+    assert(long_cnt != NULL && long_step != NULL);
+
+    /* Fast mode only works when the step is 1 */
+    if (!PyInt_Check(long_step) ||
+        PyInt_AS_LONG(long_step) != 1) {
+            slow_mode = 1;
+    }
+
+    if (slow_mode)
+        cnt = PY_SSIZE_T_MAX;
+    else
+        Py_CLEAR(long_cnt);
+
+    assert((cnt != PY_SSIZE_T_MAX && long_cnt == NULL && !slow_mode) ||
+           (cnt == PY_SSIZE_T_MAX && long_cnt != NULL && slow_mode));
+    assert(slow_mode ||
+           (PyInt_Check(long_step) && PyInt_AS_LONG(long_step) == 1));
+
+    /* create countobject structure */
+    lz = (countobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_XDECREF(long_cnt);
+        return NULL;
+    }
+    lz->cnt = cnt;
+    lz->long_cnt = long_cnt;
+    lz->long_step = long_step;
+
+    return (PyObject *)lz;
 }
 
 static void
 count_dealloc(countobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->long_cnt);
-	Py_XDECREF(lz->long_step);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->long_cnt);
+    Py_XDECREF(lz->long_step);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 count_traverse(countobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->long_cnt);
-	Py_VISIT(lz->long_step);
-	return 0;
+    Py_VISIT(lz->long_cnt);
+    Py_VISIT(lz->long_step);
+    return 0;
 }
 
 static PyObject *
 count_nextlong(countobject *lz)
 {
-	PyObject *long_cnt;
-	PyObject *stepped_up;
-
-	long_cnt = lz->long_cnt;
-	if (long_cnt == NULL) {
-		/* Switch to slow_mode */
-		long_cnt = PyInt_FromSsize_t(PY_SSIZE_T_MAX);
-		if (long_cnt == NULL)
-			return NULL;
-	}
-	assert(lz->cnt == PY_SSIZE_T_MAX && long_cnt != NULL);
-
-	stepped_up = PyNumber_Add(long_cnt, lz->long_step);
-	if (stepped_up == NULL)
-		return NULL;
-	lz->long_cnt = stepped_up;
-	return long_cnt;
+    PyObject *long_cnt;
+    PyObject *stepped_up;
+
+    long_cnt = lz->long_cnt;
+    if (long_cnt == NULL) {
+        /* Switch to slow_mode */
+        long_cnt = PyInt_FromSsize_t(PY_SSIZE_T_MAX);
+        if (long_cnt == NULL)
+            return NULL;
+    }
+    assert(lz->cnt == PY_SSIZE_T_MAX && long_cnt != NULL);
+
+    stepped_up = PyNumber_Add(long_cnt, lz->long_step);
+    if (stepped_up == NULL)
+        return NULL;
+    lz->long_cnt = stepped_up;
+    return long_cnt;
 }
 
 static PyObject *
 count_next(countobject *lz)
 {
-	if (lz->cnt == PY_SSIZE_T_MAX)
-		return count_nextlong(lz);
-	return PyInt_FromSsize_t(lz->cnt++);
+    if (lz->cnt == PY_SSIZE_T_MAX)
+        return count_nextlong(lz);
+    return PyInt_FromSsize_t(lz->cnt++);
 }
 
 static PyObject *
 count_repr(countobject *lz)
 {
-	PyObject *cnt_repr, *step_repr = NULL;
-	PyObject *result = NULL;
+    PyObject *cnt_repr, *step_repr = NULL;
+    PyObject *result = NULL;
 
     if (lz->cnt != PY_SSIZE_T_MAX)
-		return PyString_FromFormat("count(%zd)", lz->cnt);
-
-	cnt_repr = PyObject_Repr(lz->long_cnt);
-	if (cnt_repr == NULL)
-		return NULL;
-
-	if (PyInt_Check(lz->long_step) && PyInt_AS_LONG(lz->long_step) == 1) {
-			/* Don't display step when it is an integer equal to 1 */
-			result = PyString_FromFormat("count(%s)",
-										 PyString_AS_STRING(cnt_repr));
-	} else {
-		step_repr = PyObject_Repr(lz->long_step);
-		if (step_repr != NULL)
-			result = PyString_FromFormat("count(%s, %s)",
-										PyString_AS_STRING(cnt_repr),
-										PyString_AS_STRING(step_repr));
-	}
-	Py_DECREF(cnt_repr);
-	Py_XDECREF(step_repr);
-	return result;
+                return PyString_FromFormat("count(%zd)", lz->cnt);
+
+    cnt_repr = PyObject_Repr(lz->long_cnt);
+    if (cnt_repr == NULL)
+        return NULL;
+
+    if (PyInt_Check(lz->long_step) && PyInt_AS_LONG(lz->long_step) == 1) {
+                    /* Don't display step when it is an integer equal to 1 */
+            result = PyString_FromFormat("count(%s)",
+                                                                     PyString_AS_STRING(cnt_repr));
+    } else {
+        step_repr = PyObject_Repr(lz->long_step);
+        if (step_repr != NULL)
+            result = PyString_FromFormat("count(%s, %s)",
+                                                                    PyString_AS_STRING(cnt_repr),
+                                                                    PyString_AS_STRING(step_repr));
+    }
+    Py_DECREF(cnt_repr);
+    Py_XDECREF(step_repr);
+    return result;
 }
 
 static PyObject *
 count_reduce(countobject *lz)
 {
-	if (lz->cnt == PY_SSIZE_T_MAX)
-		return Py_BuildValue("O(OO)", Py_TYPE(lz), lz->long_cnt, lz->long_step);
-	return Py_BuildValue("O(n)", Py_TYPE(lz), lz->cnt);
+    if (lz->cnt == PY_SSIZE_T_MAX)
+        return Py_BuildValue("O(OO)", Py_TYPE(lz), lz->long_cnt, lz->long_step);
+    return Py_BuildValue("O(n)", Py_TYPE(lz), lz->cnt);
 }
 
 PyDoc_STRVAR(count_reduce_doc, "Return state information for pickling.");
 
 static PyMethodDef count_methods[] = {
-	{"__reduce__",	(PyCFunction)count_reduce,	METH_NOARGS,
-	 count_reduce_doc},
-	{NULL,		NULL}	/* sentinel */
+    {"__reduce__",      (PyCFunction)count_reduce,      METH_NOARGS,
+     count_reduce_doc},
+    {NULL,              NULL}   /* sentinel */
 };
 
 PyDoc_STRVAR(count_doc,
-			 "count(start=0, step=1]) --> count object\n\
+                         "count(start=0, step=1]) --> count object\n\
 \n\
 Return a count object whose .next() method returns consecutive values.\n\
 Equivalent to:\n\n\
     def count(firstval=0, step=1):\n\
-        x = firstval\n\
-        while 1:\n\
-            yield x\n\
-            x += step\n");
+    x = firstval\n\
+    while 1:\n\
+        yield x\n\
+        x += step\n");
 
 static PyTypeObject count_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.count",		/* tp_name */
-	sizeof(countobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)count_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	(reprfunc)count_repr,		/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,		/* tp_flags */
-	count_doc,			/* tp_doc */
-	(traverseproc)count_traverse,				/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)count_next,	/* tp_iternext */
-	count_methods,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	count_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.count",                  /* tp_name */
+    sizeof(countobject),                /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)count_dealloc,          /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    (reprfunc)count_repr,               /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,                    /* tp_flags */
+    count_doc,                          /* tp_doc */
+    (traverseproc)count_traverse,                               /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)count_next,           /* tp_iternext */
+    count_methods,                              /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    count_new,                          /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
@@ -3452,10 +3452,10 @@ static PyTypeObject count_type = {
 #include "Python.h"
 
 typedef struct {
-	PyObject_HEAD
-	Py_ssize_t	tuplesize;
-	PyObject *ittuple;		/* tuple of iterators */
-	PyObject *result;
+    PyObject_HEAD
+    Py_ssize_t          tuplesize;
+    PyObject *ittuple;                  /* tuple of iterators */
+    PyObject *result;
 } izipobject;
 
 static PyTypeObject izip_type;
@@ -3463,118 +3463,118 @@ static PyTypeObject izip_type;
 static PyObject *
 izip_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	izipobject *lz;
-	Py_ssize_t i;
-	PyObject *ittuple;  /* tuple of iterators */
-	PyObject *result;
-	Py_ssize_t tuplesize = PySequence_Length(args);
-
-	if (type == &izip_type && !_PyArg_NoKeywords("izip()", kwds))
-		return NULL;
-
-	/* args must be a tuple */
-	assert(PyTuple_Check(args));
-
-	/* obtain iterators */
-	ittuple = PyTuple_New(tuplesize);
-	if (ittuple == NULL)
-		return NULL;
-	for (i=0; i < tuplesize; ++i) {
-		PyObject *item = PyTuple_GET_ITEM(args, i);
-		PyObject *it = PyObject_GetIter(item);
-		if (it == NULL) {
-			if (PyErr_ExceptionMatches(PyExc_TypeError))
-				PyErr_Format(PyExc_TypeError,
-				    "izip argument #%zd must support iteration",
-				    i+1);
-			Py_DECREF(ittuple);
-			return NULL;
-		}
-		PyTuple_SET_ITEM(ittuple, i, it);
-	}
-
-	/* create a result holder */
-	result = PyTuple_New(tuplesize);
-	if (result == NULL) {
-		Py_DECREF(ittuple);
-		return NULL;
-	}
-	for (i=0 ; i < tuplesize ; i++) {
-		Py_INCREF(Py_None);
-		PyTuple_SET_ITEM(result, i, Py_None);
-	}
-
-	/* create izipobject structure */
-	lz = (izipobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(ittuple);
-		Py_DECREF(result);
-		return NULL;
-	}
-	lz->ittuple = ittuple;
-	lz->tuplesize = tuplesize;
-	lz->result = result;
-
-	return (PyObject *)lz;
+    izipobject *lz;
+    Py_ssize_t i;
+    PyObject *ittuple;  /* tuple of iterators */
+    PyObject *result;
+    Py_ssize_t tuplesize = PySequence_Length(args);
+
+    if (type == &izip_type && !_PyArg_NoKeywords("izip()", kwds))
+        return NULL;
+
+    /* args must be a tuple */
+    assert(PyTuple_Check(args));
+
+    /* obtain iterators */
+    ittuple = PyTuple_New(tuplesize);
+    if (ittuple == NULL)
+        return NULL;
+    for (i=0; i < tuplesize; ++i) {
+        PyObject *item = PyTuple_GET_ITEM(args, i);
+        PyObject *it = PyObject_GetIter(item);
+        if (it == NULL) {
+            if (PyErr_ExceptionMatches(PyExc_TypeError))
+                PyErr_Format(PyExc_TypeError,
+                    "izip argument #%zd must support iteration",
+                    i+1);
+            Py_DECREF(ittuple);
+            return NULL;
+        }
+        PyTuple_SET_ITEM(ittuple, i, it);
+    }
+
+    /* create a result holder */
+    result = PyTuple_New(tuplesize);
+    if (result == NULL) {
+        Py_DECREF(ittuple);
+        return NULL;
+    }
+    for (i=0 ; i < tuplesize ; i++) {
+        Py_INCREF(Py_None);
+        PyTuple_SET_ITEM(result, i, Py_None);
+    }
+
+    /* create izipobject structure */
+    lz = (izipobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(ittuple);
+        Py_DECREF(result);
+        return NULL;
+    }
+    lz->ittuple = ittuple;
+    lz->tuplesize = tuplesize;
+    lz->result = result;
+
+    return (PyObject *)lz;
 }
 
 static void
 izip_dealloc(izipobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->ittuple);
-	Py_XDECREF(lz->result);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->ittuple);
+    Py_XDECREF(lz->result);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 izip_traverse(izipobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->ittuple);
-	Py_VISIT(lz->result);
-	return 0;
+    Py_VISIT(lz->ittuple);
+    Py_VISIT(lz->result);
+    return 0;
 }
 
 static PyObject *
 izip_next(izipobject *lz)
 {
-	Py_ssize_t i;
-	Py_ssize_t tuplesize = lz->tuplesize;
-	PyObject *result = lz->result;
-	PyObject *it;
-	PyObject *item;
-	PyObject *olditem;
-
-	if (tuplesize == 0)
-		return NULL;
-	if (Py_REFCNT(result) == 1) {
-		Py_INCREF(result);
-		for (i=0 ; i < tuplesize ; i++) {
-			it = PyTuple_GET_ITEM(lz->ittuple, i);
-			item = (*Py_TYPE(it)->tp_iternext)(it);
-			if (item == NULL) {
-				Py_DECREF(result);
-				return NULL;
-			}
-			olditem = PyTuple_GET_ITEM(result, i);
-			PyTuple_SET_ITEM(result, i, item);
-			Py_DECREF(olditem);
-		}
-	} else {
-		result = PyTuple_New(tuplesize);
-		if (result == NULL)
-			return NULL;
-		for (i=0 ; i < tuplesize ; i++) {
-			it = PyTuple_GET_ITEM(lz->ittuple, i);
-			item = (*Py_TYPE(it)->tp_iternext)(it);
-			if (item == NULL) {
-				Py_DECREF(result);
-				return NULL;
-			}
-			PyTuple_SET_ITEM(result, i, item);
-		}
-	}
-	return result;
+    Py_ssize_t i;
+    Py_ssize_t tuplesize = lz->tuplesize;
+    PyObject *result = lz->result;
+    PyObject *it;
+    PyObject *item;
+    PyObject *olditem;
+
+    if (tuplesize == 0)
+        return NULL;
+    if (Py_REFCNT(result) == 1) {
+        Py_INCREF(result);
+        for (i=0 ; i < tuplesize ; i++) {
+            it = PyTuple_GET_ITEM(lz->ittuple, i);
+            item = (*Py_TYPE(it)->tp_iternext)(it);
+            if (item == NULL) {
+                Py_DECREF(result);
+                return NULL;
+            }
+            olditem = PyTuple_GET_ITEM(result, i);
+            PyTuple_SET_ITEM(result, i, item);
+            Py_DECREF(olditem);
+        }
+    } else {
+        result = PyTuple_New(tuplesize);
+        if (result == NULL)
+            return NULL;
+        for (i=0 ; i < tuplesize ; i++) {
+            it = PyTuple_GET_ITEM(lz->ittuple, i);
+            item = (*Py_TYPE(it)->tp_iternext)(it);
+            if (item == NULL) {
+                Py_DECREF(result);
+                return NULL;
+            }
+            PyTuple_SET_ITEM(result, i, item);
+        }
+    }
+    return result;
 }
 
 PyDoc_STRVAR(izip_doc,
@@ -3588,56 +3588,56 @@ function but consumes less memory by returning an iterator instead of\n\
 a list.");
 
 static PyTypeObject izip_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.izip",		/* tp_name */
-	sizeof(izipobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)izip_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	izip_doc,			/* tp_doc */
-	(traverseproc)izip_traverse,    /* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)izip_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	izip_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.izip",                   /* tp_name */
+    sizeof(izipobject),                 /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)izip_dealloc,           /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    izip_doc,                           /* tp_doc */
+    (traverseproc)izip_traverse,    /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)izip_next,            /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    izip_new,                           /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 
 /* repeat object ************************************************************/
 
 typedef struct {
-	PyObject_HEAD
-	PyObject *element;
-	Py_ssize_t cnt;
+    PyObject_HEAD
+    PyObject *element;
+    Py_ssize_t cnt;
 } repeatobject;
 
 static PyTypeObject repeat_type;
@@ -3645,87 +3645,87 @@ static PyTypeObject repeat_type;
 static PyObject *
 repeat_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	repeatobject *ro;
-	PyObject *element;
-	Py_ssize_t cnt = -1;
-	static char *kwargs[] = {"object", "times", NULL};
- 
- 	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|n:repeat", kwargs, 
-					 &element, &cnt))
-		return NULL;
-
-	if (PyTuple_Size(args) == 2 && cnt < 0)
-		cnt = 0;
-
-	ro = (repeatobject *)type->tp_alloc(type, 0);
-	if (ro == NULL)
-		return NULL;
-	Py_INCREF(element);
-	ro->element = element;
-	ro->cnt = cnt;
-	return (PyObject *)ro;
+    repeatobject *ro;
+    PyObject *element;
+    Py_ssize_t cnt = -1;
+    static char *kwargs[] = {"object", "times", NULL};
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|n:repeat", kwargs,
+                                     &element, &cnt))
+        return NULL;
+
+    if (PyTuple_Size(args) == 2 && cnt < 0)
+        cnt = 0;
+
+    ro = (repeatobject *)type->tp_alloc(type, 0);
+    if (ro == NULL)
+        return NULL;
+    Py_INCREF(element);
+    ro->element = element;
+    ro->cnt = cnt;
+    return (PyObject *)ro;
 }
 
 static void
 repeat_dealloc(repeatobject *ro)
 {
-	PyObject_GC_UnTrack(ro);
-	Py_XDECREF(ro->element);
-	Py_TYPE(ro)->tp_free(ro);
+    PyObject_GC_UnTrack(ro);
+    Py_XDECREF(ro->element);
+    Py_TYPE(ro)->tp_free(ro);
 }
 
 static int
 repeat_traverse(repeatobject *ro, visitproc visit, void *arg)
 {
-	Py_VISIT(ro->element);
-	return 0;
+    Py_VISIT(ro->element);
+    return 0;
 }
 
 static PyObject *
 repeat_next(repeatobject *ro)
 {
-	if (ro->cnt == 0)
-		return NULL;
-	if (ro->cnt > 0)
-		ro->cnt--;
-	Py_INCREF(ro->element);
-	return ro->element;
+    if (ro->cnt == 0)
+        return NULL;
+    if (ro->cnt > 0)
+        ro->cnt--;
+    Py_INCREF(ro->element);
+    return ro->element;
 }
 
 static PyObject *
 repeat_repr(repeatobject *ro)
 {
-	PyObject *result, *objrepr;
-
-	objrepr = PyObject_Repr(ro->element);
-	if (objrepr == NULL)
-		return NULL;
-
-	if (ro->cnt == -1)
-		result = PyString_FromFormat("repeat(%s)",
-			PyString_AS_STRING(objrepr));
-	else
-		result = PyString_FromFormat("repeat(%s, %zd)",
-			PyString_AS_STRING(objrepr), ro->cnt);
-	Py_DECREF(objrepr);
-	return result;
-}	
+    PyObject *result, *objrepr;
+
+    objrepr = PyObject_Repr(ro->element);
+    if (objrepr == NULL)
+        return NULL;
+
+    if (ro->cnt == -1)
+        result = PyString_FromFormat("repeat(%s)",
+            PyString_AS_STRING(objrepr));
+    else
+        result = PyString_FromFormat("repeat(%s, %zd)",
+            PyString_AS_STRING(objrepr), ro->cnt);
+    Py_DECREF(objrepr);
+    return result;
+}
 
 static PyObject *
 repeat_len(repeatobject *ro)
 {
-        if (ro->cnt == -1) {
-                PyErr_SetString(PyExc_TypeError, "len() of unsized object");
-		return NULL;
-	}
-        return PyInt_FromSize_t(ro->cnt);
+    if (ro->cnt == -1) {
+        PyErr_SetString(PyExc_TypeError, "len() of unsized object");
+        return NULL;
+    }
+    return PyInt_FromSize_t(ro->cnt);
 }
 
 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
 
 static PyMethodDef repeat_methods[] = {
-	{"__length_hint__", (PyCFunction)repeat_len, METH_NOARGS, length_hint_doc},
- 	{NULL,		NULL}		/* sentinel */
+    {"__length_hint__", (PyCFunction)repeat_len, METH_NOARGS, length_hint_doc},
+    {NULL,              NULL}           /* sentinel */
 };
 
 PyDoc_STRVAR(repeat_doc,
@@ -3734,47 +3734,47 @@ for the specified number of times.  If not specified, returns the object\n\
 endlessly.");
 
 static PyTypeObject repeat_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.repeat",		/* tp_name */
-	sizeof(repeatobject),		/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)repeat_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	(reprfunc)repeat_repr,		/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	repeat_doc,			/* tp_doc */
-	(traverseproc)repeat_traverse,	/* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)repeat_next,	/* tp_iternext */
-	repeat_methods,			/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	repeat_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.repeat",                 /* tp_name */
+    sizeof(repeatobject),               /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)repeat_dealloc,         /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    (reprfunc)repeat_repr,              /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    repeat_doc,                         /* tp_doc */
+    (traverseproc)repeat_traverse,      /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)repeat_next,          /* tp_iternext */
+    repeat_methods,                     /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    repeat_new,                         /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 /* iziplongest object ************************************************************/
@@ -3782,12 +3782,12 @@ static PyTypeObject repeat_type = {
 #include "Python.h"
 
 typedef struct {
-	PyObject_HEAD
-	Py_ssize_t tuplesize;
-	Py_ssize_t numactive;	
-	PyObject *ittuple;		/* tuple of iterators */
-	PyObject *result;
-	PyObject *fillvalue;
+    PyObject_HEAD
+    Py_ssize_t tuplesize;
+    Py_ssize_t numactive;
+    PyObject *ittuple;                  /* tuple of iterators */
+    PyObject *result;
+    PyObject *fillvalue;
 } iziplongestobject;
 
 static PyTypeObject iziplongest_type;
@@ -3795,159 +3795,159 @@ static PyTypeObject iziplongest_type;
 static PyObject *
 izip_longest_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 {
-	iziplongestobject *lz;
-	Py_ssize_t i;
-	PyObject *ittuple;  /* tuple of iterators */
-	PyObject *result;
-	PyObject *fillvalue = Py_None;
-	Py_ssize_t tuplesize = PySequence_Length(args);
-
-        if (kwds != NULL && PyDict_CheckExact(kwds) && PyDict_Size(kwds) > 0) {
-                fillvalue = PyDict_GetItemString(kwds, "fillvalue");
-                if (fillvalue == NULL  ||  PyDict_Size(kwds) > 1) {
-                        PyErr_SetString(PyExc_TypeError,
-				"izip_longest() got an unexpected keyword argument");
-                        return NULL;                      
-                }
+    iziplongestobject *lz;
+    Py_ssize_t i;
+    PyObject *ittuple;  /* tuple of iterators */
+    PyObject *result;
+    PyObject *fillvalue = Py_None;
+    Py_ssize_t tuplesize = PySequence_Length(args);
+
+    if (kwds != NULL && PyDict_CheckExact(kwds) && PyDict_Size(kwds) > 0) {
+        fillvalue = PyDict_GetItemString(kwds, "fillvalue");
+        if (fillvalue == NULL  ||  PyDict_Size(kwds) > 1) {
+            PyErr_SetString(PyExc_TypeError,
+                "izip_longest() got an unexpected keyword argument");
+            return NULL;
         }
-
-	/* args must be a tuple */
-	assert(PyTuple_Check(args));
-
-	/* obtain iterators */
-	ittuple = PyTuple_New(tuplesize);
-	if (ittuple == NULL)
-		return NULL;
-	for (i=0; i < tuplesize; ++i) {
-		PyObject *item = PyTuple_GET_ITEM(args, i);
-		PyObject *it = PyObject_GetIter(item);
-		if (it == NULL) {
-			if (PyErr_ExceptionMatches(PyExc_TypeError))
-				PyErr_Format(PyExc_TypeError,
-				    "izip_longest argument #%zd must support iteration",
-				    i+1);
-			Py_DECREF(ittuple);
-			return NULL;
-		}
-		PyTuple_SET_ITEM(ittuple, i, it);
-	}
-
-	/* create a result holder */
-	result = PyTuple_New(tuplesize);
-	if (result == NULL) {
-		Py_DECREF(ittuple);
-		return NULL;
-	}
-	for (i=0 ; i < tuplesize ; i++) {
-		Py_INCREF(Py_None);
-		PyTuple_SET_ITEM(result, i, Py_None);
-	}
-
-	/* create iziplongestobject structure */
-	lz = (iziplongestobject *)type->tp_alloc(type, 0);
-	if (lz == NULL) {
-		Py_DECREF(ittuple);
-		Py_DECREF(result);
-		return NULL;
-	}
-	lz->ittuple = ittuple;
-	lz->tuplesize = tuplesize;
-	lz->numactive = tuplesize;
-	lz->result = result;
-	Py_INCREF(fillvalue);
-	lz->fillvalue = fillvalue;
-	return (PyObject *)lz;
+    }
+
+    /* args must be a tuple */
+    assert(PyTuple_Check(args));
+
+    /* obtain iterators */
+    ittuple = PyTuple_New(tuplesize);
+    if (ittuple == NULL)
+        return NULL;
+    for (i=0; i < tuplesize; ++i) {
+        PyObject *item = PyTuple_GET_ITEM(args, i);
+        PyObject *it = PyObject_GetIter(item);
+        if (it == NULL) {
+            if (PyErr_ExceptionMatches(PyExc_TypeError))
+                PyErr_Format(PyExc_TypeError,
+                    "izip_longest argument #%zd must support iteration",
+                    i+1);
+            Py_DECREF(ittuple);
+            return NULL;
+        }
+        PyTuple_SET_ITEM(ittuple, i, it);
+    }
+
+    /* create a result holder */
+    result = PyTuple_New(tuplesize);
+    if (result == NULL) {
+        Py_DECREF(ittuple);
+        return NULL;
+    }
+    for (i=0 ; i < tuplesize ; i++) {
+        Py_INCREF(Py_None);
+        PyTuple_SET_ITEM(result, i, Py_None);
+    }
+
+    /* create iziplongestobject structure */
+    lz = (iziplongestobject *)type->tp_alloc(type, 0);
+    if (lz == NULL) {
+        Py_DECREF(ittuple);
+        Py_DECREF(result);
+        return NULL;
+    }
+    lz->ittuple = ittuple;
+    lz->tuplesize = tuplesize;
+    lz->numactive = tuplesize;
+    lz->result = result;
+    Py_INCREF(fillvalue);
+    lz->fillvalue = fillvalue;
+    return (PyObject *)lz;
 }
 
 static void
 izip_longest_dealloc(iziplongestobject *lz)
 {
-	PyObject_GC_UnTrack(lz);
-	Py_XDECREF(lz->ittuple);
-	Py_XDECREF(lz->result);
-	Py_XDECREF(lz->fillvalue);
-	Py_TYPE(lz)->tp_free(lz);
+    PyObject_GC_UnTrack(lz);
+    Py_XDECREF(lz->ittuple);
+    Py_XDECREF(lz->result);
+    Py_XDECREF(lz->fillvalue);
+    Py_TYPE(lz)->tp_free(lz);
 }
 
 static int
 izip_longest_traverse(iziplongestobject *lz, visitproc visit, void *arg)
 {
-	Py_VISIT(lz->ittuple);
-	Py_VISIT(lz->result);
-	Py_VISIT(lz->fillvalue);
-	return 0;
+    Py_VISIT(lz->ittuple);
+    Py_VISIT(lz->result);
+    Py_VISIT(lz->fillvalue);
+    return 0;
 }
 
 static PyObject *
 izip_longest_next(iziplongestobject *lz)
 {
-        Py_ssize_t i;
-        Py_ssize_t tuplesize = lz->tuplesize;
-        PyObject *result = lz->result;
-        PyObject *it;
-        PyObject *item;
-        PyObject *olditem;
-
-        if (tuplesize == 0)
-                return NULL;
-        if (lz->numactive == 0)
-                return NULL;
-        if (Py_REFCNT(result) == 1) {
-                Py_INCREF(result);
-                for (i=0 ; i < tuplesize ; i++) {
-                        it = PyTuple_GET_ITEM(lz->ittuple, i);
-                        if (it == NULL) {
-                                Py_INCREF(lz->fillvalue);
-                                item = lz->fillvalue;
-                        } else {
-                                item = PyIter_Next(it);
-                                if (item == NULL) {
-                                        lz->numactive -= 1;
-                                        if (lz->numactive == 0 || PyErr_Occurred()) {
-                                                lz->numactive = 0;
-                                                Py_DECREF(result);
-                                                return NULL;
-                                        } else {
-                                                Py_INCREF(lz->fillvalue);
-                                                item = lz->fillvalue;
-                                                PyTuple_SET_ITEM(lz->ittuple, i, NULL);
-                                                Py_DECREF(it);
-                                        }
-                                }
-                        }
-                        olditem = PyTuple_GET_ITEM(result, i);
-                        PyTuple_SET_ITEM(result, i, item);
-                        Py_DECREF(olditem);
+    Py_ssize_t i;
+    Py_ssize_t tuplesize = lz->tuplesize;
+    PyObject *result = lz->result;
+    PyObject *it;
+    PyObject *item;
+    PyObject *olditem;
+
+    if (tuplesize == 0)
+        return NULL;
+    if (lz->numactive == 0)
+        return NULL;
+    if (Py_REFCNT(result) == 1) {
+        Py_INCREF(result);
+        for (i=0 ; i < tuplesize ; i++) {
+            it = PyTuple_GET_ITEM(lz->ittuple, i);
+            if (it == NULL) {
+                Py_INCREF(lz->fillvalue);
+                item = lz->fillvalue;
+            } else {
+                item = PyIter_Next(it);
+                if (item == NULL) {
+                    lz->numactive -= 1;
+                    if (lz->numactive == 0 || PyErr_Occurred()) {
+                        lz->numactive = 0;
+                        Py_DECREF(result);
+                        return NULL;
+                    } else {
+                        Py_INCREF(lz->fillvalue);
+                        item = lz->fillvalue;
+                        PyTuple_SET_ITEM(lz->ittuple, i, NULL);
+                        Py_DECREF(it);
+                    }
                 }
-        } else {
-                result = PyTuple_New(tuplesize);
-                if (result == NULL)
+            }
+            olditem = PyTuple_GET_ITEM(result, i);
+            PyTuple_SET_ITEM(result, i, item);
+            Py_DECREF(olditem);
+        }
+    } else {
+        result = PyTuple_New(tuplesize);
+        if (result == NULL)
+            return NULL;
+        for (i=0 ; i < tuplesize ; i++) {
+            it = PyTuple_GET_ITEM(lz->ittuple, i);
+            if (it == NULL) {
+                Py_INCREF(lz->fillvalue);
+                item = lz->fillvalue;
+            } else {
+                item = PyIter_Next(it);
+                if (item == NULL) {
+                    lz->numactive -= 1;
+                    if (lz->numactive == 0 || PyErr_Occurred()) {
+                        lz->numactive = 0;
+                        Py_DECREF(result);
                         return NULL;
-                for (i=0 ; i < tuplesize ; i++) {
-                        it = PyTuple_GET_ITEM(lz->ittuple, i);
-                        if (it == NULL) {
-                                Py_INCREF(lz->fillvalue);
-                                item = lz->fillvalue;
-                        } else {
-                                item = PyIter_Next(it);
-                                if (item == NULL) {
-                                        lz->numactive -= 1;
-                                        if (lz->numactive == 0 || PyErr_Occurred()) {
-                                                lz->numactive = 0;
-                                                Py_DECREF(result);
-                                                return NULL;
-                                        } else {
-                                                Py_INCREF(lz->fillvalue);
-                                                item = lz->fillvalue;
-                                                PyTuple_SET_ITEM(lz->ittuple, i, NULL);
-                                                Py_DECREF(it);
-                                        }
-                                }
-                        }
-                        PyTuple_SET_ITEM(result, i, item);
+                    } else {
+                        Py_INCREF(lz->fillvalue);
+                        item = lz->fillvalue;
+                        PyTuple_SET_ITEM(lz->ittuple, i, NULL);
+                        Py_DECREF(it);
+                    }
                 }
+            }
+            PyTuple_SET_ITEM(result, i, item);
         }
-        return result;
+    }
+    return result;
 }
 
 PyDoc_STRVAR(izip_longest_doc,
@@ -3962,47 +3962,47 @@ defaults to None or can be specified by a keyword argument.\n\
 ");
 
 static PyTypeObject iziplongest_type = {
-	PyVarObject_HEAD_INIT(NULL, 0)
-	"itertools.izip_longest",	/* tp_name */
-	sizeof(iziplongestobject),	/* tp_basicsize */
-	0,				/* tp_itemsize */
-	/* methods */
-	(destructor)izip_longest_dealloc,	/* tp_dealloc */
-	0,				/* tp_print */
-	0,				/* tp_getattr */
-	0,				/* tp_setattr */
-	0,				/* tp_compare */
-	0,				/* tp_repr */
-	0,				/* tp_as_number */
-	0,				/* tp_as_sequence */
-	0,				/* tp_as_mapping */
-	0,				/* tp_hash */
-	0,				/* tp_call */
-	0,				/* tp_str */
-	PyObject_GenericGetAttr,	/* tp_getattro */
-	0,				/* tp_setattro */
-	0,				/* tp_as_buffer */
-	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
-		Py_TPFLAGS_BASETYPE,	/* tp_flags */
-	izip_longest_doc,			/* tp_doc */
-	(traverseproc)izip_longest_traverse,    /* tp_traverse */
-	0,				/* tp_clear */
-	0,				/* tp_richcompare */
-	0,				/* tp_weaklistoffset */
-	PyObject_SelfIter,		/* tp_iter */
-	(iternextfunc)izip_longest_next,	/* tp_iternext */
-	0,				/* tp_methods */
-	0,				/* tp_members */
-	0,				/* tp_getset */
-	0,				/* tp_base */
-	0,				/* tp_dict */
-	0,				/* tp_descr_get */
-	0,				/* tp_descr_set */
-	0,				/* tp_dictoffset */
-	0,				/* tp_init */
-	0,				/* tp_alloc */
-	izip_longest_new,			/* tp_new */
-	PyObject_GC_Del,		/* tp_free */
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "itertools.izip_longest",           /* tp_name */
+    sizeof(iziplongestobject),          /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    /* methods */
+    (destructor)izip_longest_dealloc,           /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_compare */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* tp_as_sequence */
+    0,                                  /* tp_as_mapping */
+    0,                                  /* tp_hash */
+    0,                                  /* tp_call */
+    0,                                  /* tp_str */
+    PyObject_GenericGetAttr,            /* tp_getattro */
+    0,                                  /* tp_setattro */
+    0,                                  /* tp_as_buffer */
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+        Py_TPFLAGS_BASETYPE,            /* tp_flags */
+    izip_longest_doc,                           /* tp_doc */
+    (traverseproc)izip_longest_traverse,    /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    PyObject_SelfIter,                  /* tp_iter */
+    (iternextfunc)izip_longest_next,            /* tp_iternext */
+    0,                                  /* tp_methods */
+    0,                                  /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    0,                                  /* tp_init */
+    0,                                  /* tp_alloc */
+    izip_longest_new,                           /* tp_new */
+    PyObject_GC_Del,                    /* tp_free */
 };
 
 /* module level code ********************************************************/
@@ -4040,57 +4040,57 @@ combinations_with_replacement(p, r)\n\
 
 
 static PyMethodDef module_methods[] = {
-	{"tee",	(PyCFunction)tee,	METH_VARARGS, tee_doc},
- 	{NULL,		NULL}		/* sentinel */
+    {"tee",     (PyCFunction)tee,       METH_VARARGS, tee_doc},
+    {NULL,              NULL}           /* sentinel */
 };
 
 PyMODINIT_FUNC
 inititertools(void)
 {
-	int i;
-	PyObject *m;
-	char *name;
-	PyTypeObject *typelist[] = {
-		&combinations_type,
-		&cwr_type,
-		&cycle_type,
-		&dropwhile_type,
-		&takewhile_type,
-		&islice_type,
-		&starmap_type,
-		&imap_type,
-		&chain_type,
-		&compress_type,
-		&ifilter_type,
-		&ifilterfalse_type,
-		&count_type,
-		&izip_type,
-		&iziplongest_type,
-		&permutations_type,
-		&product_type,
-		&repeat_type,
-		&groupby_type,
-		NULL
-	};
-
-	Py_TYPE(&teedataobject_type) = &PyType_Type;
-	m = Py_InitModule3("itertools", module_methods, module_doc);
-	if (m == NULL)
-		return;
-
-	for (i=0 ; typelist[i] != NULL ; i++) {
-		if (PyType_Ready(typelist[i]) < 0)
-			return;
-		name = strchr(typelist[i]->tp_name, '.');
-		assert (name != NULL);
-		Py_INCREF(typelist[i]);
-		PyModule_AddObject(m, name+1, (PyObject *)typelist[i]);
-	}
-
-	if (PyType_Ready(&teedataobject_type) < 0)
-		return;
-	if (PyType_Ready(&tee_type) < 0)
-		return;
-	if (PyType_Ready(&_grouper_type) < 0)
-		return;
+    int i;
+    PyObject *m;
+    char *name;
+    PyTypeObject *typelist[] = {
+        &combinations_type,
+        &cwr_type,
+        &cycle_type,
+        &dropwhile_type,
+        &takewhile_type,
+        &islice_type,
+        &starmap_type,
+        &imap_type,
+        &chain_type,
+        &compress_type,
+        &ifilter_type,
+        &ifilterfalse_type,
+        &count_type,
+        &izip_type,
+        &iziplongest_type,
+        &permutations_type,
+        &product_type,
+        &repeat_type,
+        &groupby_type,
+        NULL
+    };
+
+    Py_TYPE(&teedataobject_type) = &PyType_Type;
+    m = Py_InitModule3("itertools", module_methods, module_doc);
+    if (m == NULL)
+        return;
+
+    for (i=0 ; typelist[i] != NULL ; i++) {
+        if (PyType_Ready(typelist[i]) < 0)
+            return;
+        name = strchr(typelist[i]->tp_name, '.');
+        assert (name != NULL);
+        Py_INCREF(typelist[i]);
+        PyModule_AddObject(m, name+1, (PyObject *)typelist[i]);
+    }
+
+    if (PyType_Ready(&teedataobject_type) < 0)
+        return;
+    if (PyType_Ready(&tee_type) < 0)
+        return;
+    if (PyType_Ready(&_grouper_type) < 0)
+        return;
 }