PEP 3123: Provide forward compatibility with Python 3.0, while keeping

backwards compatibility. Add Py_Refcnt, Py_Type, Py_Size, and
PyVarObject_HEAD_INIT.

59 files changed, 440 insertions, 548 deletions

diff --git a/Modules/_bsddb.c b/Modules/_bsddb.c
index e71169c..0347907 100644
--- a/Modules/_bsddb.c
+++ b/Modules/_bsddb.c
@@ -300,13 +300,13 @@ staticforward PyTypeObject DBSequence_Type;
 
 staticforward PyTypeObject DB_Type, DBCursor_Type, DBEnv_Type, DBTxn_Type, DBLock_Type;
 
-#define DBObject_Check(v)           ((v)->ob_type == &DB_Type)
-#define DBCursorObject_Check(v)     ((v)->ob_type == &DBCursor_Type)
-#define DBEnvObject_Check(v)        ((v)->ob_type == &DBEnv_Type)
-#define DBTxnObject_Check(v)        ((v)->ob_type == &DBTxn_Type)
-#define DBLockObject_Check(v)       ((v)->ob_type == &DBLock_Type)
+#define DBObject_Check(v)           (Py_Type(v) == &DB_Type)
+#define DBCursorObject_Check(v)     (Py_Type(v) == &DBCursor_Type)
+#define DBEnvObject_Check(v)        (Py_Type(v) == &DBEnv_Type)
+#define DBTxnObject_Check(v)        (Py_Type(v) == &DBTxn_Type)
+#define DBLockObject_Check(v)       (Py_Type(v) == &DBLock_Type)
 #if (DBVER >= 43)
-#define DBSequenceObject_Check(v)   ((v)->ob_type == &DBSequence_Type)
+#define DBSequenceObject_Check(v)   (Py_Type(v) == &DBSequence_Type)
 #endif
 
 
@@ -461,7 +461,7 @@ make_key_dbt(DBObject* self, PyObject* keyobj, DBT* key, int* pflags)
     else {
         PyErr_Format(PyExc_TypeError,
                      "String or Integer object expected for key, %s found",
-                     keyobj->ob_type->tp_name);
+                     Py_Type(keyobj)->tp_name);
         return 0;
     }
 
@@ -616,7 +616,7 @@ static int makeDBError(int err)
 static void makeTypeError(char* expected, PyObject* found)
 {
     PyErr_Format(PyExc_TypeError, "Expected %s argument, %s found.",
-                 expected, found->ob_type->tp_name);
+                 expected, Py_Type(found)->tp_name);
 }
 
 
@@ -5666,13 +5666,13 @@ DL_EXPORT(void) init_bsddb(void)
 
     /* Initialize the type of the new type objects here; doing it here
        is required for portability to Windows without requiring C++. */
-    DB_Type.ob_type = &PyType_Type;
-    DBCursor_Type.ob_type = &PyType_Type;
-    DBEnv_Type.ob_type = &PyType_Type;
-    DBTxn_Type.ob_type = &PyType_Type;
-    DBLock_Type.ob_type = &PyType_Type;
+    Py_Type(&DB_Type) = &PyType_Type;
+    Py_Type(&DBCursor_Type) = &PyType_Type;
+    Py_Type(&DBEnv_Type) = &PyType_Type;
+    Py_Type(&DBTxn_Type) = &PyType_Type;
+    Py_Type(&DBLock_Type) = &PyType_Type;
 #if (DBVER >= 43)    
-    DBSequence_Type.ob_type = &PyType_Type;
+    Py_Type(&DBSequence_Type) = &PyType_Type;
 #endif    
 
 
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index c70019c..7f5e2ae 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -544,7 +544,7 @@ deque_dealloc(dequeobject *deque)
 	}
 	deque->leftblock = NULL;
 	deque->rightblock = NULL;
-	deque->ob_type->tp_free(deque);
+	Py_Type(deque)->tp_free(deque);
 }
 
 static int
@@ -579,7 +579,7 @@ deque_nohash(PyObject *self)
 static PyObject *
 deque_copy(PyObject *deque)
 {
-	return PyObject_CallFunctionObjArgs((PyObject *)(deque->ob_type),
+	return PyObject_CallFunctionObjArgs((PyObject *)(Py_Type(deque)),
 		deque, NULL);
 }
 
@@ -601,7 +601,7 @@ deque_reduce(dequeobject *deque)
 		Py_DECREF(dict);
 		return NULL;
 	}
-	result = Py_BuildValue("O()ON", deque->ob_type, dict, it);
+	result = Py_BuildValue("O()ON", Py_Type(deque), dict, it);
 	Py_DECREF(dict);
 	return result;
 }
@@ -825,8 +825,7 @@ PyDoc_STRVAR(deque_doc,
 Build an ordered collection accessible from endpoints only.");
 
 static PyTypeObject deque_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"collections.deque",		/* tp_name */
 	sizeof(dequeobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -903,7 +902,7 @@ static void
 dequeiter_dealloc(dequeiterobject *dio)
 {
 	Py_XDECREF(dio->deque);
-	dio->ob_type->tp_free(dio);
+	Py_Type(dio)->tp_free(dio);
 }
 
 static PyObject *
@@ -948,8 +947,7 @@ static PyMethodDef dequeiter_methods[] = {
 };
 
 PyTypeObject dequeiter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"deque_iterator",			/* tp_name */
 	sizeof(dequeiterobject),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1031,8 +1029,7 @@ dequereviter_next(dequeiterobject *it)
 }
 
 PyTypeObject dequereviter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"deque_reverse_iterator",		/* tp_name */
 	sizeof(dequeiterobject),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1113,7 +1110,7 @@ defdict_copy(defdictobject *dd)
 	   whose class constructor has the same signature.  Subclasses that
 	   define a different constructor signature must override copy().
 	*/
-	return PyObject_CallFunctionObjArgs((PyObject *)dd->dict.ob_type,
+	return PyObject_CallFunctionObjArgs(Py_Type(dd),
 					    dd->default_factory, dd, NULL);
 }
 
@@ -1156,7 +1153,7 @@ defdict_reduce(defdictobject *dd)
 		Py_DECREF(args);
 		return NULL;
 	}
-	result = PyTuple_Pack(5, dd->dict.ob_type, args,
+	result = PyTuple_Pack(5, Py_Type(dd), args,
 			      Py_None, Py_None, items);
 	Py_DECREF(items);
 	Py_DECREF(args);
@@ -1288,8 +1285,7 @@ A defaultdict compares equal to a dict with the same items.\n\
 #define DEFERRED_ADDRESS(ADDR) 0
 
 static PyTypeObject defdict_type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"collections.defaultdict",	/* tp_name */
 	sizeof(defdictobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/_csv.c b/Modules/_csv.c
index 5e03635..1bb8332 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -125,7 +125,7 @@ typedef struct {
 
 staticforward PyTypeObject Reader_Type;
 
-#define ReaderObject_Check(v)   ((v)->ob_type == &Reader_Type)
+#define ReaderObject_Check(v)   (Py_Type(v) == &Reader_Type)
 
 typedef struct {
         PyObject_HEAD
@@ -310,7 +310,7 @@ static void
 Dialect_dealloc(DialectObj *self)
 {
         Py_XDECREF(self->lineterminator);
-        self->ob_type->tp_free((PyObject *)self);
+        Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static char *dialect_kws[] = {
@@ -460,8 +460,7 @@ PyDoc_STRVAR(Dialect_Type_doc,
 "The Dialect type records CSV parsing and generation options.\n");
 
 static PyTypeObject Dialect_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_csv.Dialect",                         /* tp_name */
 	sizeof(DialectObj),                     /* tp_basicsize */
 	0,                                      /* tp_itemsize */
@@ -869,8 +868,7 @@ static struct PyMemberDef Reader_memberlist[] = {
 
 
 static PyTypeObject Reader_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_csv.reader",                          /*tp_name*/
 	sizeof(ReaderObj),                      /*tp_basicsize*/
 	0,                                      /*tp_itemsize*/
@@ -1280,8 +1278,7 @@ PyDoc_STRVAR(Writer_Type_doc,
 );
 
 static PyTypeObject Writer_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_csv.writer",                          /*tp_name*/
 	sizeof(WriterObj),                      /*tp_basicsize*/
 	0,                                      /*tp_itemsize*/
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index 8eeb865..020f473 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -333,7 +333,7 @@ CDataType_from_param(PyObject *type, PyObject *value)
 			Py_INCREF(value);
 			return value;
 		}
-		ob_name = (ob) ? ob->ob_type->tp_name : "???";
+		ob_name = (ob) ? Py_Type(ob)->tp_name : "???";
 		PyErr_Format(PyExc_TypeError,
 			     "expected %s instance instead of pointer to %s",
 			     ((PyTypeObject *)type)->tp_name, ob_name);
@@ -349,7 +349,7 @@ CDataType_from_param(PyObject *type, PyObject *value)
 	PyErr_Format(PyExc_TypeError,
 		     "expected %s instance instead of %s",
 		     ((PyTypeObject *)type)->tp_name,
-		     value->ob_type->tp_name);
+		     Py_Type(value)->tp_name);
 	return NULL;
 }
 
@@ -435,8 +435,7 @@ UnionType_setattro(PyObject *self, PyObject *key, PyObject *value)
 
 
 PyTypeObject StructType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.StructType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -478,8 +477,7 @@ PyTypeObject StructType_Type = {
 };
 
 static PyTypeObject UnionType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.UnionType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -693,8 +691,7 @@ static PyMethodDef PointerType_methods[] = {
 };
 
 PyTypeObject PointerType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.PointerType",				/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -751,7 +748,7 @@ CharArray_set_raw(CDataObject *self, PyObject *value)
 	char *ptr;
 	Py_ssize_t size;
 	if (PyBuffer_Check(value)) {
-		size = value->ob_type->tp_as_buffer->bf_getreadbuffer(value, 0, (void *)&ptr);
+		size = Py_Type(value)->tp_as_buffer->bf_getreadbuffer(value, 0, (void *)&ptr);
 		if (size < 0)
 			return -1;
 	} else if (-1 == PyString_AsStringAndSize(value, &ptr, &size)) {
@@ -800,7 +797,7 @@ CharArray_set_value(CDataObject *self, PyObject *value)
 	} else if (!PyString_Check(value)) {
 		PyErr_Format(PyExc_TypeError,
 			     "string expected instead of %s instance",
-			     value->ob_type->tp_name);
+			     Py_Type(value)->tp_name);
 		return -1;
 	} else
 		Py_INCREF(value);
@@ -855,7 +852,7 @@ WCharArray_set_value(CDataObject *self, PyObject *value)
 	} else if (!PyUnicode_Check(value)) {
 		PyErr_Format(PyExc_TypeError,
 				"unicode string expected instead of %s instance",
-				value->ob_type->tp_name);
+				Py_Type(value)->tp_name);
 		return -1;
 	} else
 		Py_INCREF(value);
@@ -1051,8 +1048,7 @@ ArrayType_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 }
 
 PyTypeObject ArrayType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.ArrayType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1684,8 +1680,7 @@ static PyMethodDef SimpleType_methods[] = {
 };
 
 PyTypeObject SimpleType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.SimpleType",				/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -1899,8 +1894,7 @@ CFuncPtrType_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 }
 
 PyTypeObject CFuncPtrType_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.CFuncPtrType",			/* tp_name */
 	0,					/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -2076,7 +2070,7 @@ static void
 CData_dealloc(PyObject *self)
 {
 	CData_clear((CDataObject *)self);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyMemberDef CData_members[] = {
@@ -2143,8 +2137,7 @@ static PyMethodDef CData_methods[] = {
 };
 
 PyTypeObject CData_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes._CData",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -2350,7 +2343,7 @@ _CData_set(CDataObject *dst, PyObject *type, SETFUNC setfunc, PyObject *value,
 			PyErr_Format(PyExc_TypeError,
 				     "expected %s instance, got %s",
 				     ((PyTypeObject *)type)->tp_name,
-				     value->ob_type->tp_name);
+				     Py_Type(value)->tp_name);
 			return NULL;
 		}
 	}
@@ -2381,7 +2374,7 @@ _CData_set(CDataObject *dst, PyObject *type, SETFUNC setfunc, PyObject *value,
 		if (p1->proto != p2->proto) {
 			PyErr_Format(PyExc_TypeError,
 				     "incompatible types, %s instance instead of %s instance",
-				     value->ob_type->tp_name,
+				     Py_Type(value)->tp_name,
 				     ((PyTypeObject *)type)->tp_name);
 			return NULL;
 		}
@@ -2400,7 +2393,7 @@ _CData_set(CDataObject *dst, PyObject *type, SETFUNC setfunc, PyObject *value,
 	}
 	PyErr_Format(PyExc_TypeError,
 		     "incompatible types, %s instance instead of %s instance",
-		     value->ob_type->tp_name,
+		     Py_Type(value)->tp_name,
 		     ((PyTypeObject *)type)->tp_name);
 	return NULL;
 }
@@ -2661,7 +2654,7 @@ _check_outarg_type(PyObject *arg, Py_ssize_t index)
 		     Py_SAFE_DOWNCAST(index, Py_ssize_t, int),
 		     PyType_Check(arg) ?
 		     ((PyTypeObject *)arg)->tp_name :
-		     arg->ob_type->tp_name);
+		     Py_Type(arg)->tp_name);
 	return 0;
 }
 
@@ -3447,7 +3440,7 @@ static void
 CFuncPtr_dealloc(CFuncPtrObject *self)
 {
 	CFuncPtr_clear(self);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static PyObject *
@@ -3457,17 +3450,16 @@ CFuncPtr_repr(CFuncPtrObject *self)
 	if (self->index)
 		return PyString_FromFormat("<COM method offset %d: %s at %p>",
 					   self->index - 0x1000,
-					   self->ob_type->tp_name,
+					   Py_Type(self)->tp_name,
 					   self);
 #endif
 	return PyString_FromFormat("<%s object at %p>",
-				   self->ob_type->tp_name,
+				   Py_Type(self)->tp_name,
 				   self);
 }
 
 PyTypeObject CFuncPtr_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.CFuncPtr",
 	sizeof(CFuncPtrObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3595,8 +3587,7 @@ Struct_init(PyObject *self, PyObject *args, PyObject *kwds)
 }
 
 static PyTypeObject Struct_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.Structure",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3638,8 +3629,7 @@ static PyTypeObject Struct_Type = {
 };
 
 static PyTypeObject Union_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.Union",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3871,8 +3861,7 @@ static PySequenceMethods Array_as_sequence = {
 };
 
 PyTypeObject Array_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.Array",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -4025,7 +4014,7 @@ static PyGetSetDef Simple_getsets[] = {
 static PyObject *
 Simple_from_outparm(PyObject *self, PyObject *args)
 {
-	if (IsSimpleSubType((PyObject *)self->ob_type)) {
+	if (IsSimpleSubType((PyObject *)Py_Type(self))) {
 		Py_INCREF(self);
 		return self;
 	}
@@ -4090,9 +4079,9 @@ Simple_repr(CDataObject *self)
 	PyObject *val, *name, *args, *result;
 	static PyObject *format;
 
-	if (self->ob_type->tp_base != &Simple_Type) {
+	if (Py_Type(self)->tp_base != &Simple_Type) {
 		return PyString_FromFormat("<%s object at %p>",
-					   self->ob_type->tp_name, self);
+					   Py_Type(self)->tp_name, self);
 	}
 
 	if (format == NULL) {
@@ -4105,7 +4094,7 @@ Simple_repr(CDataObject *self)
 	if (val == NULL)
 		return NULL;
 
-	name = PyString_FromString(self->ob_type->tp_name);
+	name = PyString_FromString(Py_Type(self)->tp_name);
 	if (name == NULL) {
 		Py_DECREF(val);
 		return NULL;
@@ -4123,8 +4112,7 @@ Simple_repr(CDataObject *self)
 }
 
 static PyTypeObject Simple_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes._SimpleCData",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -4277,7 +4265,7 @@ Pointer_set_contents(CDataObject *self, PyObject *value, void *closure)
 		PyErr_Format(PyExc_TypeError,
 			     "expected %s instead of %s",
 			     ((PyTypeObject *)(stgdict->proto))->tp_name,
-			     value->ob_type->tp_name);
+			     Py_Type(value)->tp_name);
 		return -1;
 	}
 
@@ -4406,8 +4394,7 @@ static PyNumberMethods Pointer_as_number = {
 };
 
 PyTypeObject Pointer_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes._Pointer",
 	sizeof(CDataObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -4585,7 +4572,7 @@ cast_check_pointertype(PyObject *arg)
 		     "cast() argument 2 must be a pointer type, not %s",
 		     PyType_Check(arg)
 		     ? ((PyTypeObject *)arg)->tp_name
-		     : arg->ob_type->tp_name);
+		     : Py_Type(arg)->tp_name);
 	return 0;
 }
 
@@ -4712,37 +4699,37 @@ init_ctypes(void)
 	if (PyType_Ready(&CData_Type) < 0)
 		return;
 
-	Struct_Type.ob_type = &StructType_Type;
+	Py_Type(&Struct_Type) = &StructType_Type;
 	Struct_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Struct_Type) < 0)
 		return;
 	PyModule_AddObject(m, "Structure", (PyObject *)&Struct_Type);
 
-	Union_Type.ob_type = &UnionType_Type;
+	Py_Type(&Union_Type) = &UnionType_Type;
 	Union_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Union_Type) < 0)
 		return;
 	PyModule_AddObject(m, "Union", (PyObject *)&Union_Type);
 
-	Pointer_Type.ob_type = &PointerType_Type;
+	Py_Type(&Pointer_Type) = &PointerType_Type;
 	Pointer_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Pointer_Type) < 0)
 		return;
 	PyModule_AddObject(m, "_Pointer", (PyObject *)&Pointer_Type);
 
-	Array_Type.ob_type = &ArrayType_Type;
+	Py_Type(&Array_Type) = &ArrayType_Type;
 	Array_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Array_Type) < 0)
 		return;
 	PyModule_AddObject(m, "Array", (PyObject *)&Array_Type);
 
-	Simple_Type.ob_type = &SimpleType_Type;
+	Py_Type(&Simple_Type) = &SimpleType_Type;
 	Simple_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&Simple_Type) < 0)
 		return;
 	PyModule_AddObject(m, "_SimpleCData", (PyObject *)&Simple_Type);
 
-	CFuncPtr_Type.ob_type = &CFuncPtrType_Type;
+	Py_Type(&CFuncPtr_Type) = &CFuncPtrType_Type;
 	CFuncPtr_Type.tp_base = &CData_Type;
 	if (PyType_Ready(&CFuncPtr_Type) < 0)
 		return;
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 7f95b9e..80d6dff 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -381,8 +381,7 @@ static PyMemberDef PyCArgType_members[] = {
 };
 
 PyTypeObject PyCArg_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"CArgObject",
 	sizeof(PyCArgObject),
 	0,
@@ -1180,7 +1179,7 @@ call_commethod(PyObject *self, PyObject *args)
 	if (!CDataObject_Check(pcom) || (pcom->b_size != sizeof(void *))) {
 		PyErr_Format(PyExc_TypeError,
 			     "COM Pointer expected instead of %s instance",
-			     pcom->ob_type->tp_name);
+			     Py_Type(pcom)->tp_name);
 		return NULL;
 	}
 
@@ -1420,7 +1419,7 @@ byref(PyObject *self, PyObject *obj)
 	if (!CDataObject_Check(obj)) {
 		PyErr_Format(PyExc_TypeError,
 			     "byref() argument must be a ctypes instance, not '%s'",
-			     obj->ob_type->tp_name);
+			     Py_Type(obj)->tp_name);
 		return NULL;
 	}
 
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index ccdab0a..0e4c19e 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -286,8 +286,7 @@ CField_repr(CFieldObject *self)
 }
 
 PyTypeObject CField_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_ctypes.CField",				/* tp_name */
 	sizeof(CFieldObject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
diff --git a/Modules/_ctypes/stgdict.c b/Modules/_ctypes/stgdict.c
index cfa72ef..a126eb7 100644
--- a/Modules/_ctypes/stgdict.c
+++ b/Modules/_ctypes/stgdict.c
@@ -83,8 +83,7 @@ StgDict_clone(StgDictObject *dst, StgDictObject *src)
 }
 
 PyTypeObject StgDict_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"StgDict",
 	sizeof(StgDictObject),
 	0,
@@ -192,7 +191,7 @@ MakeFields(PyObject *type, CFieldObject *descr,
 			Py_DECREF(fieldlist);
 			return -1;
 		}
-		if (fdescr->ob_type != &CField_Type) {
+		if (Py_Type(fdescr) != &CField_Type) {
 			PyErr_SetString(PyExc_TypeError, "unexpected type");
 			Py_DECREF(fdescr);
 			Py_DECREF(fieldlist);
@@ -215,7 +214,7 @@ MakeFields(PyObject *type, CFieldObject *descr,
 			Py_DECREF(fieldlist);
 			return -1;
 		}
-		assert(new_descr->ob_type == &CField_Type);
+		assert(Py_Type(new_descr) == &CField_Type);
  		new_descr->size = fdescr->size;
  		new_descr->offset = fdescr->offset + offset;
  		new_descr->index = fdescr->index + index;
@@ -263,7 +262,7 @@ MakeAnonFields(PyObject *type)
 			Py_DECREF(anon_names);
 			return -1;
 		}
-		assert(descr->ob_type == &CField_Type);
+		assert(Py_Type(descr) == &CField_Type);
 		descr->anonymous = 1;
 
 		/* descr is in the field descriptor. */
diff --git a/Modules/_curses_panel.c b/Modules/_curses_panel.c
index 0acf3fd..5eb4cf8 100644
--- a/Modules/_curses_panel.c
+++ b/Modules/_curses_panel.c
@@ -56,7 +56,7 @@ typedef struct {
 
 PyTypeObject PyCursesPanel_Type;
 
-#define PyCursesPanel_Check(v)	 ((v)->ob_type == &PyCursesPanel_Type)
+#define PyCursesPanel_Check(v)	 (Py_Type(v) == &PyCursesPanel_Type)
 
 /* Some helper functions. The problem is that there's always a window
    associated with a panel. To ensure that Python's GC doesn't pull
@@ -338,8 +338,7 @@ PyCursesPanel_GetAttr(PyCursesPanelObject *self, char *name)
 /* -------------------------------------------------------*/
 
 PyTypeObject PyCursesPanel_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_curses_panel.curses panel",	/*tp_name*/
     sizeof(PyCursesPanelObject),	/*tp_basicsize*/
     0,			/*tp_itemsize*/
@@ -458,7 +457,7 @@ init_curses_panel(void)
     PyObject *m, *d, *v;
 
     /* Initialize object type */
-    PyCursesPanel_Type.ob_type = &PyType_Type;
+    Py_Type(&PyCursesPanel_Type) = &PyType_Type;
 
     import_curses();
 
diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index 1ee407e..fa6548a 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -1566,8 +1566,7 @@ PyCursesWindow_GetAttr(PyCursesWindowObject *self, char *name)
 /* -------------------------------------------------------*/
 
 PyTypeObject PyCursesWindow_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_curses.curses window",	/*tp_name*/
 	sizeof(PyCursesWindowObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -2657,7 +2656,7 @@ init_curses(void)
 	static void *PyCurses_API[PyCurses_API_pointers];
 
 	/* Initialize object type */
-	PyCursesWindow_Type.ob_type = &PyType_Type;
+	Py_Type(&PyCursesWindow_Type) = &PyType_Type;
 
 	/* Initialize the C API pointer array */
 	PyCurses_API[0] = (void *)&PyCursesWindow_Type;
diff --git a/Modules/_elementtree.c b/Modules/_elementtree.c
index f21cf56..d8a28b4 100644
--- a/Modules/_elementtree.c
+++ b/Modules/_elementtree.c
@@ -269,7 +269,7 @@ typedef struct {
 
 staticforward PyTypeObject Element_Type;
 
-#define Element_CheckExact(op) ((op)->ob_type == &Element_Type)
+#define Element_CheckExact(op) (Py_Type(op) == &Element_Type)
 
 /* -------------------------------------------------------------------- */
 /* element constructor and destructor */
@@ -1207,7 +1207,7 @@ element_setslice(PyObject* self_, Py_ssize_t start, Py_ssize_t end, PyObject* it
         /* FIXME: support arbitrary sequences? */
         PyErr_Format(
             PyExc_TypeError,
-            "expected list, not \"%.200s\"", item->ob_type->tp_name
+            "expected list, not \"%.200s\"", Py_Type(item)->tp_name
             );
         return -1;
     }
@@ -1440,7 +1440,7 @@ typedef struct {
 
 staticforward PyTypeObject TreeBuilder_Type;
 
-#define TreeBuilder_CheckExact(op) ((op)->ob_type == &TreeBuilder_Type)
+#define TreeBuilder_CheckExact(op) (Py_Type(op) == &TreeBuilder_Type)
 
 /* -------------------------------------------------------------------- */
 /* constructor and destructor */
@@ -1607,7 +1607,7 @@ treebuilder_handle_data(TreeBuilderObject* self, PyObject* data)
         Py_INCREF(data); self->data = data;
     } else {
         /* more than one item; use a list to collect items */
-        if (PyString_CheckExact(self->data) && self->data->ob_refcnt == 1 &&
+        if (PyString_CheckExact(self->data) && Py_Refcnt(self->data) == 1 &&
             PyString_CheckExact(data) && PyString_GET_SIZE(data) == 1) {
             /* expat often generates single character data sections; handle
                the most common case by resizing the existing string... */
@@ -2623,9 +2623,9 @@ init_elementtree(void)
 #endif
 
     /* Patch object type */
-    Element_Type.ob_type = TreeBuilder_Type.ob_type = &PyType_Type;
+    Py_Type(&Element_Type) = Py_Type(&TreeBuilder_Type) = &PyType_Type;
 #if defined(USE_EXPAT)
-    XMLParser_Type.ob_type = &PyType_Type;
+    Py_Type(&XMLParser_Type) = &PyType_Type;
 #endif
 
     m = Py_InitModule("_elementtree", _functions);
diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
index 54abb89..96bdc20 100644
--- a/Modules/_functoolsmodule.c
+++ b/Modules/_functoolsmodule.c
@@ -81,7 +81,7 @@ partial_dealloc(partialobject *pto)
 	Py_XDECREF(pto->args);
 	Py_XDECREF(pto->kw);
 	Py_XDECREF(pto->dict);
-	pto->ob_type->tp_free(pto);
+	Py_Type(pto)->tp_free(pto);
 }
 
 static PyObject *
@@ -197,8 +197,7 @@ static PyGetSetDef partial_getsetlist[] = {
 };
 
 static PyTypeObject partial_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"functools.partial",		/* tp_name */
 	sizeof(partialobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/_hashopenssl.c b/Modules/_hashopenssl.c
index 859644f..fa8dafc 100644
--- a/Modules/_hashopenssl.c
+++ b/Modules/_hashopenssl.c
@@ -281,8 +281,7 @@ name -- the hash algorithm being used by this object\n\
 digest_size -- number of bytes in this hashes output\n");
 
 static PyTypeObject EVPtype = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_hashlib.HASH",    /*tp_name*/
     sizeof(EVPobject),	/*tp_basicsize*/
     0,			/*tp_itemsize*/
@@ -464,7 +463,7 @@ init_hashlib(void)
      * but having some be unsupported.  Only init appropriate
      * constants. */
 
-    EVPtype.ob_type = &PyType_Type;
+    Py_Type(&EVPtype) = &PyType_Type;
     if (PyType_Ready(&EVPtype) < 0)
         return;
 
diff --git a/Modules/_hotshot.c b/Modules/_hotshot.c
index 21bd383..4bbb3b5 100644
--- a/Modules/_hotshot.c
+++ b/Modules/_hotshot.c
@@ -1220,8 +1220,7 @@ PyDoc_STRVAR(profiler_object__doc__,
 "linetimings:  True if line events collect timing information.");
 
 static PyTypeObject ProfilerType = {
-    PyObject_HEAD_INIT(NULL)
-    0,					/* ob_size		*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_hotshot.ProfilerType",		/* tp_name		*/
     (int) sizeof(ProfilerObject),	/* tp_basicsize		*/
     0,					/* tp_itemsize		*/
@@ -1305,8 +1304,7 @@ static PyGetSetDef logreader_getsets[] = {
 };
 
 static PyTypeObject LogReaderType = {
-    PyObject_HEAD_INIT(NULL)
-    0,					/* ob_size		*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_hotshot.LogReaderType",		/* tp_name		*/
     (int) sizeof(LogReaderObject),	/* tp_basicsize		*/
     0,					/* tp_itemsize		*/
@@ -1613,8 +1611,8 @@ init_hotshot(void)
 {
     PyObject *module;
 
-    LogReaderType.ob_type = &PyType_Type;
-    ProfilerType.ob_type = &PyType_Type;
+    Py_Type(&LogReaderType) = &PyType_Type;
+    Py_Type(&ProfilerType) = &PyType_Type;
     module = Py_InitModule("_hotshot", functions);
     if (module != NULL) {
         char *s = get_version_string();
diff --git a/Modules/_lsprof.c b/Modules/_lsprof.c
index d35c894..5b03b56 100644
--- a/Modules/_lsprof.c
+++ b/Modules/_lsprof.c
@@ -120,7 +120,7 @@ typedef struct {
 staticforward PyTypeObject PyProfiler_Type;
 
 #define PyProfiler_Check(op) PyObject_TypeCheck(op, &PyProfiler_Type)
-#define PyProfiler_CheckExact(op) ((op)->ob_type == &PyProfiler_Type)
+#define PyProfiler_CheckExact(op) (Py_Type(op) == &PyProfiler_Type)
 
 /*** External Timers ***/
 
@@ -207,7 +207,7 @@ normalizeUserObj(PyObject *obj)
 		PyObject *self = fn->m_self;
 		PyObject *name = PyString_FromString(fn->m_ml->ml_name);
 		if (name != NULL) {
-			PyObject *mo = _PyType_Lookup(self->ob_type, name);
+			PyObject *mo = _PyType_Lookup(Py_Type(self), name);
 			Py_XINCREF(mo);
 			Py_DECREF(name);
 			if (mo != NULL) {
@@ -744,7 +744,7 @@ profiler_dealloc(ProfilerObject *op)
 	flush_unmatched(op);
 	clearEntries(op);
 	Py_XDECREF(op->externalTimer);
-	op->ob_type->tp_free(op);
+	Py_Type(op)->tp_free(op);
 }
 
 static int
diff --git a/Modules/_randommodule.c b/Modules/_randommodule.c
index 591947e..25adc2e 100644
--- a/Modules/_randommodule.c
+++ b/Modules/_randommodule.c
@@ -84,7 +84,7 @@ typedef struct {
 
 static PyTypeObject Random_Type;
 
-#define RandomObject_Check(v)	   ((v)->ob_type == &Random_Type)
+#define RandomObject_Check(v)	   (Py_Type(v) == &Random_Type)
 
 
 /* Random methods */
@@ -404,7 +404,7 @@ random_jumpahead(RandomObject *self, PyObject *n)
 	if (!PyInt_Check(n) && !PyLong_Check(n)) {
 		PyErr_Format(PyExc_TypeError, "jumpahead requires an "
 			     "integer, not '%s'",
-			     n->ob_type->tp_name);
+			     Py_Type(n)->tp_name);
 		return NULL;
 	}
 
@@ -518,8 +518,7 @@ PyDoc_STRVAR(random_doc,
 "Random() -> create a random number generator with its own internal state.");
 
 static PyTypeObject Random_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_random.Random",		/*tp_name*/
 	sizeof(RandomObject),		/*tp_basicsize*/
 	0,				/*tp_itemsize*/
diff --git a/Modules/_sqlite/cache.c b/Modules/_sqlite/cache.c
index 6094eb3..829c175 100644
--- a/Modules/_sqlite/cache.c
+++ b/Modules/_sqlite/cache.c
@@ -51,7 +51,7 @@ void pysqlite_node_dealloc(pysqlite_Node* self)
     Py_DECREF(self->key);
     Py_DECREF(self->data);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 int pysqlite_cache_init(pysqlite_Cache* self, PyObject* args, PyObject* kwargs)
@@ -109,7 +109,7 @@ void pysqlite_cache_dealloc(pysqlite_Cache* self)
     }
     Py_DECREF(self->mapping);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyObject* pysqlite_cache_get(pysqlite_Cache* self, PyObject* args)
@@ -274,8 +274,7 @@ static PyMethodDef cache_methods[] = {
 };
 
 PyTypeObject pysqlite_NodeType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME "Node",                             /* tp_name */
         sizeof(pysqlite_Node),                          /* tp_basicsize */
         0,                                              /* tp_itemsize */
@@ -317,8 +316,7 @@ PyTypeObject pysqlite_NodeType = {
 };
 
 PyTypeObject pysqlite_CacheType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Cache",                           /* tp_name */
         sizeof(pysqlite_Cache),                         /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 924d582..add2e6f 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -205,7 +205,7 @@ void pysqlite_connection_dealloc(pysqlite_Connection* self)
     Py_XDECREF(self->collations);
     Py_XDECREF(self->statements);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyObject* pysqlite_connection_cursor(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)
@@ -1206,8 +1206,7 @@ static struct PyMemberDef connection_members[] =
 };
 
 PyTypeObject pysqlite_ConnectionType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Connection",                      /* tp_name */
         sizeof(pysqlite_Connection),                    /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/cursor.c b/Modules/_sqlite/cursor.c
index 4ca1063..2032a25 100644
--- a/Modules/_sqlite/cursor.c
+++ b/Modules/_sqlite/cursor.c
@@ -134,7 +134,7 @@ void pysqlite_cursor_dealloc(pysqlite_Cursor* self)
     Py_XDECREF(self->row_factory);
     Py_XDECREF(self->next_row);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyObject* _pysqlite_get_converter(PyObject* key)
@@ -1020,8 +1020,7 @@ static char cursor_doc[] =
 PyDoc_STR("SQLite database cursor class.");
 
 PyTypeObject pysqlite_CursorType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Cursor",                          /* tp_name */
         sizeof(pysqlite_Cursor),                        /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/prepare_protocol.c b/Modules/_sqlite/prepare_protocol.c
index a8ca518..c979610 100644
--- a/Modules/_sqlite/prepare_protocol.c
+++ b/Modules/_sqlite/prepare_protocol.c
@@ -30,12 +30,11 @@ int pysqlite_prepare_protocol_init(pysqlite_PrepareProtocol* self, PyObject* arg
 
 void pysqlite_prepare_protocol_dealloc(pysqlite_PrepareProtocol* self)
 {
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 PyTypeObject pysqlite_PrepareProtocolType= {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".PrepareProtocol",                 /* tp_name */
         sizeof(pysqlite_PrepareProtocol),               /* tp_basicsize */
         0,                                              /* tp_itemsize */
@@ -79,6 +78,6 @@ PyTypeObject pysqlite_PrepareProtocolType= {
 extern int pysqlite_prepare_protocol_setup_types(void)
 {
     pysqlite_PrepareProtocolType.tp_new = PyType_GenericNew;
-    pysqlite_PrepareProtocolType.ob_type= &PyType_Type;
+    Py_Type(&pysqlite_PrepareProtocolType)= &PyType_Type;
     return PyType_Ready(&pysqlite_PrepareProtocolType);
 }
diff --git a/Modules/_sqlite/row.c b/Modules/_sqlite/row.c
index 7cfcfc3..9ada8a9 100644
--- a/Modules/_sqlite/row.c
+++ b/Modules/_sqlite/row.c
@@ -30,7 +30,7 @@ void pysqlite_row_dealloc(pysqlite_Row* self)
     Py_XDECREF(self->data);
     Py_XDECREF(self->description);
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 int pysqlite_row_init(pysqlite_Row* self, PyObject* args, PyObject* kwargs)
@@ -183,8 +183,7 @@ static PyMethodDef pysqlite_row_methods[] = {
 
 
 PyTypeObject pysqlite_RowType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Row",                             /* tp_name */
         sizeof(pysqlite_Row),                           /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sqlite/statement.c b/Modules/_sqlite/statement.c
index 86d2178..20c1aac 100644
--- a/Modules/_sqlite/statement.c
+++ b/Modules/_sqlite/statement.c
@@ -309,7 +309,7 @@ void pysqlite_statement_dealloc(pysqlite_Statement* self)
         PyObject_ClearWeakRefs((PyObject*)self);
     }
 
-    self->ob_type->tp_free((PyObject*)self);
+    Py_Type(self)->tp_free((PyObject*)self);
 }
 
 /*
@@ -383,8 +383,7 @@ static int pysqlite_check_remaining_sql(const char* tail)
 }
 
 PyTypeObject pysqlite_StatementType = {
-        PyObject_HEAD_INIT(NULL)
-        0,                                              /* ob_size */
+        PyVarObject_HEAD_INIT(NULL, 0)
         MODULE_NAME ".Statement",                       /* tp_name */
         sizeof(pysqlite_Statement),                     /* tp_basicsize */
         0,                                              /* tp_itemsize */
diff --git a/Modules/_sre.c b/Modules/_sre.c
index c1eb71c..7dafaeb 100644
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -1689,7 +1689,7 @@ getstring(PyObject* string, Py_ssize_t* p_length, int* p_charsize)
 #endif
 
     /* get pointer to string buffer */
-    buffer = string->ob_type->tp_as_buffer;
+    buffer = Py_Type(string)->tp_as_buffer;
     if (!buffer || !buffer->bf_getreadbuffer || !buffer->bf_getsegcount ||
         buffer->bf_getsegcount(string, NULL) != 1) {
         PyErr_SetString(PyExc_TypeError, "expected string or buffer");
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index f1e1092..d0f7115 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -72,7 +72,7 @@ static PyObject *PySSL_SSLread(PySSLObject *self, PyObject *args);
 static int check_socket_and_wait_for_timeout(PySocketSockObject *s, 
 					     int writing);
 
-#define PySSLObject_Check(v)	((v)->ob_type == &PySSL_Type)
+#define PySSLObject_Check(v)	(Py_Type(v) == &PySSL_Type)
 
 typedef enum {
 	SOCKET_IS_NONBLOCKING,
@@ -570,8 +570,7 @@ static PyObject *PySSL_getattr(PySSLObject *self, char *name)
 }
 
 static PyTypeObject PySSL_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"socket.SSL",			/*tp_name*/
 	sizeof(PySSLObject),		/*tp_basicsize*/
 	0,				/*tp_itemsize*/
@@ -632,7 +631,7 @@ PySSL_RAND_egd(PyObject *self, PyObject *arg)
     if (!PyString_Check(arg))
 	return PyErr_Format(PyExc_TypeError,
 			    "RAND_egd() expected string, found %s",
-			    arg->ob_type->tp_name);
+			    Py_Type(arg)->tp_name);
     bytes = RAND_egd(PyString_AS_STRING(arg));
     if (bytes == -1) {
 	PyErr_SetString(PySSLErrorObject,
@@ -678,7 +677,7 @@ init_ssl(void)
 {
 	PyObject *m, *d;
 
-	PySSL_Type.ob_type = &PyType_Type;
+	Py_Type(&PySSL_Type) = &PyType_Type;
 
 	m = Py_InitModule3("_ssl", PySSL_methods, module_doc);
 	if (m == NULL)
diff --git a/Modules/_struct.c b/Modules/_struct.c
index ee938d6..36e64be 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -72,7 +72,7 @@ typedef struct {
 
 
 #define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType)
-#define PyStruct_CheckExact(op) ((op)->ob_type == &PyStructType)
+#define PyStruct_CheckExact(op) (Py_Type(op) == &PyStructType)
 
 
 /* Exception */
@@ -133,7 +133,7 @@ get_pylong(PyObject *v)
 		Py_INCREF(v);
 		return v;
 	}
-	m = v->ob_type->tp_as_number;
+	m = Py_Type(v)->tp_as_number;
 	if (m != NULL && m->nb_long != NULL) {
 		v = m->nb_long(v);
 		if (v == NULL)
@@ -1487,7 +1487,7 @@ s_dealloc(PyStructObject *s)
 		PyMem_FREE(s->s_codes);
 	}
 	Py_XDECREF(s->s_format);
-	s->ob_type->tp_free((PyObject *)s);
+	Py_Type(s)->tp_free((PyObject *)s);
 }
 
 static PyObject *
@@ -1806,8 +1806,7 @@ static PyGetSetDef s_getsetlist[] = {
 
 static
 PyTypeObject PyStructType = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"Struct",
 	sizeof(PyStructObject),
 	0,
@@ -1857,7 +1856,7 @@ init_struct(void)
 	if (m == NULL)
 		return;
 
-	PyStructType.ob_type = &PyType_Type;
+	Py_Type(&PyStructType) = &PyType_Type;
 	if (PyType_Ready(&PyStructType) < 0)
 		return;
 
diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 84dc1e1..c5a0bc5 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -839,8 +839,7 @@ static void test_structmembers_free(PyObject *ob){
 }
 
 static PyTypeObject test_structmembersType = {
-    PyObject_HEAD_INIT(NULL)
-    0,
+    PyVarObject_HEAD_INIT(NULL, 0)
 	"test_structmembersType",
 	sizeof(test_structmembers),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -890,7 +889,7 @@ init_testcapi(void)
 	if (m == NULL)
 		return;
 
-	test_structmembersType.ob_type=&PyType_Type;
+	Py_Type(&test_structmembersType)=&PyType_Type;
 	Py_INCREF(&test_structmembersType);
 	PyModule_AddObject(m, "test_structmembersType", (PyObject *)&test_structmembersType);
 
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 22d930b..07570f3 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -262,12 +262,12 @@ typedef struct {
 	Tcl_ObjType *StringType;
 } TkappObject;
 
-#define Tkapp_Check(v) ((v)->ob_type == &Tkapp_Type)
+#define Tkapp_Check(v) (Py_Type(v) == &Tkapp_Type)
 #define Tkapp_Interp(v) (((TkappObject *) (v))->interp)
 #define Tkapp_Result(v) Tcl_GetStringResult(Tkapp_Interp(v))
 
 #define DEBUG_REFCNT(v) (printf("DEBUG: id=%p, refcnt=%i\n", \
-(void *) v, ((PyObject *) v)->ob_refcnt))
+(void *) v, Py_Refcnt(v)))
 
 
 
@@ -2420,8 +2420,7 @@ Tktt_GetAttr(PyObject *self, char *name)
 
 static PyTypeObject Tktt_Type =
 {
-	PyObject_HEAD_INIT(NULL)
-	0,				     /*ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"tktimertoken",			     /*tp_name */
 	sizeof(TkttObject),		     /*tp_basicsize */
 	0,				     /*tp_itemsize */
@@ -2765,8 +2764,7 @@ Tkapp_GetAttr(PyObject *self, char *name)
 
 static PyTypeObject Tkapp_Type =
 {
-	PyObject_HEAD_INIT(NULL)
-	0,				     /*ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"tkapp",			     /*tp_name */
 	sizeof(TkappObject),		     /*tp_basicsize */
 	0,				     /*tp_itemsize */
@@ -3105,7 +3103,7 @@ init_tkinter(void)
 {
 	PyObject *m, *d;
 
-	Tkapp_Type.ob_type = &PyType_Type;
+	Py_Type(&Tkapp_Type) = &PyType_Type;
 
 #ifdef WITH_THREAD
 	tcl_lock = PyThread_allocate_lock();
@@ -3133,10 +3131,10 @@ init_tkinter(void)
 
 	PyDict_SetItemString(d, "TkappType", (PyObject *)&Tkapp_Type);
 
-	Tktt_Type.ob_type = &PyType_Type;
+	Py_Type(&Tktt_Type) = &PyType_Type;
 	PyDict_SetItemString(d, "TkttType", (PyObject *)&Tktt_Type);
 
-	PyTclObject_Type.ob_type = &PyType_Type;
+	Py_Type(&PyTclObject_Type) = &PyType_Type;
 	PyDict_SetItemString(d, "Tcl_Obj", (PyObject *)&PyTclObject_Type);
 
 #ifdef TK_AQUA
diff --git a/Modules/_typesmodule.c b/Modules/_typesmodule.c
index 5a6f2b9..e925664 100644
--- a/Modules/_typesmodule.c
+++ b/Modules/_typesmodule.c
@@ -33,8 +33,7 @@ static PyGetSetDef helper_getset[] = {
 };
 
 static PyTypeObject HelperType = {
-    PyObject_HEAD_INIT(NULL)
-    0,						/* ob_size */
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_types.Helper",				/* tp_name */
     sizeof(Helper),                             /* tp_basicsize */
     0,						/* tp_itemsize */
diff --git a/Modules/_weakref.c b/Modules/_weakref.c
index 1712f12..cb7977b 100644
--- a/Modules/_weakref.c
+++ b/Modules/_weakref.c
@@ -14,7 +14,7 @@ weakref_getweakrefcount(PyObject *self, PyObject *object)
 {
     PyObject *result = NULL;
 
-    if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {
+    if (PyType_SUPPORTS_WEAKREFS(Py_Type(object))) {
         PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
 
         result = PyInt_FromSsize_t(_PyWeakref_GetWeakrefCount(*list));
@@ -35,7 +35,7 @@ weakref_getweakrefs(PyObject *self, PyObject *object)
 {
     PyObject *result = NULL;
 
-    if (PyType_SUPPORTS_WEAKREFS(object->ob_type)) {
+    if (PyType_SUPPORTS_WEAKREFS(Py_Type(object))) {
         PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
         Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list);
 
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 3ba5cf8..21a5e5b 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -39,7 +39,7 @@ typedef struct arrayobject {
 static PyTypeObject Arraytype;
 
 #define array_Check(op) PyObject_TypeCheck(op, &Arraytype)
-#define array_CheckExact(op) ((op)->ob_type == &Arraytype)
+#define array_CheckExact(op) (Py_Type(op) == &Arraytype)
 
 static int
 array_resize(arrayobject *self, Py_ssize_t newsize)
@@ -53,9 +53,9 @@ array_resize(arrayobject *self, Py_ssize_t newsize)
 	*/
 
 	if (self->allocated >= newsize &&
-	    self->ob_size < newsize + 16 &&
+	    Py_Size(self) < newsize + 16 &&
 	    self->ob_item != NULL) {
-		self->ob_size = newsize;
+		Py_Size(self) = newsize;
 		return 0;
 	}
 
@@ -71,7 +71,7 @@ array_resize(arrayobject *self, Py_ssize_t newsize)
 	 * memory critical.
 	 */
 
-	_new_size = (newsize >> 4) + (self->ob_size < 8 ? 3 : 7) + newsize;
+	_new_size = (newsize >> 4) + (Py_Size(self) < 8 ? 3 : 7) + newsize;
 	items = self->ob_item;
 	/* XXX The following multiplication and division does not optimize away 
 	   like it does for lists since the size is not known at compile time */
@@ -84,7 +84,7 @@ array_resize(arrayobject *self, Py_ssize_t newsize)
 		return -1;
 	}
 	self->ob_item = items;
-	self->ob_size = newsize;
+	Py_Size(self) = newsize;
 	self->allocated = _new_size;
 	return 0;
 }
@@ -432,7 +432,7 @@ newarrayobject(PyTypeObject *type, Py_ssize_t size, struct arraydescr *descr)
 	if (op == NULL) {
 		return NULL;
 	}
-	op->ob_size = size;
+	Py_Size(op) = size;
 	if (size <= 0) {
 		op->ob_item = NULL;
 	}
@@ -455,7 +455,7 @@ getarrayitem(PyObject *op, Py_ssize_t i)
 	register arrayobject *ap;
 	assert(array_Check(op));
 	ap = (arrayobject *)op;
-	assert(i>=0 && i<ap->ob_size);
+	assert(i>=0 && i<Py_Size(ap));
 	return (*ap->ob_descr->getitem)(ap, i);
 }
 
@@ -463,7 +463,7 @@ static int
 ins1(arrayobject *self, Py_ssize_t where, PyObject *v)
 {
 	char *items;
-	Py_ssize_t n = self->ob_size;
+	Py_ssize_t n = Py_Size(self);
 	if (v == NULL) {
 		PyErr_BadInternalCall();
 		return -1;
@@ -498,7 +498,7 @@ array_dealloc(arrayobject *op)
 		PyObject_ClearWeakRefs((PyObject *) op);
 	if (op->ob_item != NULL)
 		PyMem_DEL(op->ob_item);
-	op->ob_type->tp_free((PyObject *)op);
+	Py_Type(op)->tp_free((PyObject *)op);
 }
 
 static PyObject *
@@ -518,7 +518,7 @@ array_richcompare(PyObject *v, PyObject *w, int op)
 	va = (arrayobject *)v;
 	wa = (arrayobject *)w;
 
-	if (va->ob_size != wa->ob_size && (op == Py_EQ || op == Py_NE)) {
+	if (Py_Size(va) != Py_Size(wa) && (op == Py_EQ || op == Py_NE)) {
 		/* Shortcut: if the lengths differ, the arrays differ */
 		if (op == Py_EQ)
 			res = Py_False;
@@ -530,7 +530,7 @@ array_richcompare(PyObject *v, PyObject *w, int op)
 
 	/* Search for the first index where items are different */
 	k = 1;
-	for (i = 0; i < va->ob_size && i < wa->ob_size; i++) {
+	for (i = 0; i < Py_Size(va) && i < Py_Size(wa); i++) {
 		vi = getarrayitem(v, i);
 		wi = getarrayitem(w, i);
 		if (vi == NULL || wi == NULL) {
@@ -549,8 +549,8 @@ array_richcompare(PyObject *v, PyObject *w, int op)
 
 	if (k) {
 		/* No more items to compare -- compare sizes */
-		Py_ssize_t vs = va->ob_size;
-		Py_ssize_t ws = wa->ob_size;
+		Py_ssize_t vs = Py_Size(va);
+		Py_ssize_t ws = Py_Size(wa);
 		int cmp;
 		switch (op) {
 		case Py_LT: cmp = vs <  ws; break;
@@ -590,13 +590,13 @@ array_richcompare(PyObject *v, PyObject *w, int op)
 static Py_ssize_t
 array_length(arrayobject *a)
 {
-	return a->ob_size;
+	return Py_Size(a);
 }
 
 static PyObject *
 array_item(arrayobject *a, Py_ssize_t i)
 {
-	if (i < 0 || i >= a->ob_size) {
+	if (i < 0 || i >= Py_Size(a)) {
 		PyErr_SetString(PyExc_IndexError, "array index out of range");
 		return NULL;
 	}
@@ -609,14 +609,14 @@ array_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh)
 	arrayobject *np;
 	if (ilow < 0)
 		ilow = 0;
-	else if (ilow > a->ob_size)
-		ilow = a->ob_size;
+	else if (ilow > Py_Size(a))
+		ilow = Py_Size(a);
 	if (ihigh < 0)
 		ihigh = 0;
 	if (ihigh < ilow)
 		ihigh = ilow;
-	else if (ihigh > a->ob_size)
-		ihigh = a->ob_size;
+	else if (ihigh > Py_Size(a))
+		ihigh = Py_Size(a);
 	np = (arrayobject *) newarrayobject(&Arraytype, ihigh - ilow, a->ob_descr);
 	if (np == NULL)
 		return NULL;
@@ -628,7 +628,7 @@ array_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh)
 static PyObject *
 array_copy(arrayobject *a, PyObject *unused)
 {
-	return array_slice(a, 0, a->ob_size);
+	return array_slice(a, 0, Py_Size(a));
 }
 
 PyDoc_STRVAR(copy_doc,
@@ -644,7 +644,7 @@ array_concat(arrayobject *a, PyObject *bb)
 	if (!array_Check(bb)) {
 		PyErr_Format(PyExc_TypeError,
 		     "can only append array (not \"%.200s\") to array",
-			     bb->ob_type->tp_name);
+			     Py_Type(bb)->tp_name);
 		return NULL;
 	}
 #define b ((arrayobject *)bb)
@@ -652,14 +652,14 @@ array_concat(arrayobject *a, PyObject *bb)
 		PyErr_BadArgument();
 		return NULL;
 	}
-	size = a->ob_size + b->ob_size;
+	size = Py_Size(a) + Py_Size(b);
 	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
 	if (np == NULL) {
 		return NULL;
 	}
-	memcpy(np->ob_item, a->ob_item, a->ob_size*a->ob_descr->itemsize);
-	memcpy(np->ob_item + a->ob_size*a->ob_descr->itemsize,
-	       b->ob_item, b->ob_size*b->ob_descr->itemsize);
+	memcpy(np->ob_item, a->ob_item, Py_Size(a)*a->ob_descr->itemsize);
+	memcpy(np->ob_item + Py_Size(a)*a->ob_descr->itemsize,
+	       b->ob_item, Py_Size(b)*b->ob_descr->itemsize);
 	return (PyObject *)np;
 #undef b
 }
@@ -674,12 +674,12 @@ array_repeat(arrayobject *a, Py_ssize_t n)
 	Py_ssize_t nbytes;
 	if (n < 0)
 		n = 0;
-	size = a->ob_size * n;
+	size = Py_Size(a) * n;
 	np = (arrayobject *) newarrayobject(&Arraytype, size, a->ob_descr);
 	if (np == NULL)
 		return NULL;
 	p = np->ob_item;
-	nbytes = a->ob_size * a->ob_descr->itemsize;
+	nbytes = Py_Size(a) * a->ob_descr->itemsize;
 	for (i = 0; i < n; i++) {
 		memcpy(p, a->ob_item, nbytes);
 		p += nbytes;
@@ -697,7 +697,7 @@ array_ass_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
 	if (v == NULL)
 		n = 0;
 	else if (array_Check(v)) {
-		n = b->ob_size;
+		n = Py_Size(b);
 		if (a == b) {
 			/* Special case "a[i:j] = a" -- copy b first */
 			int ret;
@@ -716,44 +716,44 @@ array_ass_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
 	else {
 		PyErr_Format(PyExc_TypeError,
 	     "can only assign array (not \"%.200s\") to array slice",
-			     v->ob_type->tp_name);
+			     Py_Type(v)->tp_name);
 		return -1;
 	}
 	if (ilow < 0)
 		ilow = 0;
-	else if (ilow > a->ob_size)
-		ilow = a->ob_size;
+	else if (ilow > Py_Size(a))
+		ilow = Py_Size(a);
 	if (ihigh < 0)
 		ihigh = 0;
 	if (ihigh < ilow)
 		ihigh = ilow;
-	else if (ihigh > a->ob_size)
-		ihigh = a->ob_size;
+	else if (ihigh > Py_Size(a))
+		ihigh = Py_Size(a);
 	item = a->ob_item;
 	d = n - (ihigh-ilow);
 	if (d < 0) { /* Delete -d items */
 		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
 			item + ihigh*a->ob_descr->itemsize,
-			(a->ob_size-ihigh)*a->ob_descr->itemsize);
-		a->ob_size += d;
-		PyMem_RESIZE(item, char, a->ob_size*a->ob_descr->itemsize);
+			(Py_Size(a)-ihigh)*a->ob_descr->itemsize);
+		Py_Size(a) += d;
+		PyMem_RESIZE(item, char, Py_Size(a)*a->ob_descr->itemsize);
 						/* Can't fail */
 		a->ob_item = item;
-		a->allocated = a->ob_size;
+		a->allocated = Py_Size(a);
 	}
 	else if (d > 0) { /* Insert d items */
 		PyMem_RESIZE(item, char,
-			     (a->ob_size + d)*a->ob_descr->itemsize);
+			     (Py_Size(a) + d)*a->ob_descr->itemsize);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return -1;
 		}
 		memmove(item + (ihigh+d)*a->ob_descr->itemsize,
 			item + ihigh*a->ob_descr->itemsize,
-			(a->ob_size-ihigh)*a->ob_descr->itemsize);
+			(Py_Size(a)-ihigh)*a->ob_descr->itemsize);
 		a->ob_item = item;
-		a->ob_size += d;
-		a->allocated = a->ob_size;
+		Py_Size(a) += d;
+		a->allocated = Py_Size(a);
 	}
 	if (n > 0)
 		memcpy(item + ilow*a->ob_descr->itemsize, b->ob_item,
@@ -765,7 +765,7 @@ array_ass_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v)
 static int
 array_ass_item(arrayobject *a, Py_ssize_t i, PyObject *v)
 {
-	if (i < 0 || i >= a->ob_size) {
+	if (i < 0 || i >= Py_Size(a)) {
 		PyErr_SetString(PyExc_IndexError,
 			         "array assignment index out of range");
 		return -1;
@@ -792,7 +792,7 @@ array_iter_extend(arrayobject *self, PyObject *bb)
 		return -1;
 
 	while ((v = PyIter_Next(it)) != NULL) {
-		if (ins1(self, (int) self->ob_size, v) != 0) {
+		if (ins1(self, (int) Py_Size(self), v) != 0) {
 			Py_DECREF(v);
 			Py_DECREF(it);
 			return -1;
@@ -818,16 +818,16 @@ array_do_extend(arrayobject *self, PyObject *bb)
 			     "can only extend with array of same kind");
 		return -1;
 	}
-	size = self->ob_size + b->ob_size;
+	size = Py_Size(self) + Py_Size(b);
         PyMem_RESIZE(self->ob_item, char, size*self->ob_descr->itemsize);
         if (self->ob_item == NULL) {
                 PyObject_Del(self);
                 PyErr_NoMemory();
 		return -1;
         }
-	memcpy(self->ob_item + self->ob_size*self->ob_descr->itemsize,
-               b->ob_item, b->ob_size*b->ob_descr->itemsize);
-	self->ob_size = size;
+	memcpy(self->ob_item + Py_Size(self)*self->ob_descr->itemsize,
+               b->ob_item, Py_Size(b)*b->ob_descr->itemsize);
+	Py_Size(self) = size;
 	self->allocated = size;
 
 	return 0;
@@ -840,7 +840,7 @@ array_inplace_concat(arrayobject *self, PyObject *bb)
 	if (!array_Check(bb)) {
 		PyErr_Format(PyExc_TypeError,
 			"can only extend array with array (not \"%.200s\")",
-			bb->ob_type->tp_name);
+			Py_Type(bb)->tp_name);
 		return NULL;
 	}
 	if (array_do_extend(self, bb) == -1)
@@ -855,15 +855,15 @@ array_inplace_repeat(arrayobject *self, Py_ssize_t n)
 	char *items, *p;
 	Py_ssize_t size, i;
 
-	if (self->ob_size > 0) {
+	if (Py_Size(self) > 0) {
 		if (n < 0)
 			n = 0;
 		items = self->ob_item;
-		size = self->ob_size * self->ob_descr->itemsize;
+		size = Py_Size(self) * self->ob_descr->itemsize;
 		if (n == 0) {
 			PyMem_FREE(items);
 			self->ob_item = NULL;
-			self->ob_size = 0;
+			Py_Size(self) = 0;
 			self->allocated = 0;
 		}
 		else {
@@ -876,8 +876,8 @@ array_inplace_repeat(arrayobject *self, Py_ssize_t n)
 				memcpy(p, items, size);
 			}
 			self->ob_item = items;
-			self->ob_size *= n;
-			self->allocated = self->ob_size;
+			Py_Size(self) *= n;
+			self->allocated = Py_Size(self);
 		}
 	}
 	Py_INCREF(self);
@@ -900,7 +900,7 @@ array_count(arrayobject *self, PyObject *v)
 	Py_ssize_t count = 0;
 	Py_ssize_t i;
 
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self, i);
 		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -922,7 +922,7 @@ array_index(arrayobject *self, PyObject *v)
 {
 	Py_ssize_t i;
 
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self, i);
 		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -947,7 +947,7 @@ array_contains(arrayobject *self, PyObject *v)
 	Py_ssize_t i;
 	int cmp;
 
-	for (i = 0, cmp = 0 ; cmp == 0 && i < self->ob_size; i++) {
+	for (i = 0, cmp = 0 ; cmp == 0 && i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self, i);
 		cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -960,7 +960,7 @@ array_remove(arrayobject *self, PyObject *v)
 {
 	int i;
 
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *selfi = getarrayitem((PyObject *)self,i);
 		int cmp = PyObject_RichCompareBool(selfi, v, Py_EQ);
 		Py_DECREF(selfi);
@@ -990,14 +990,14 @@ array_pop(arrayobject *self, PyObject *args)
 	PyObject *v;
 	if (!PyArg_ParseTuple(args, "|n:pop", &i))
 		return NULL;
-	if (self->ob_size == 0) {
+	if (Py_Size(self) == 0) {
 		/* Special-case most common failure cause */
 		PyErr_SetString(PyExc_IndexError, "pop from empty array");
 		return NULL;
 	}
 	if (i < 0)
-		i += self->ob_size;
-	if (i < 0 || i >= self->ob_size) {
+		i += Py_Size(self);
+	if (i < 0 || i >= Py_Size(self)) {
 		PyErr_SetString(PyExc_IndexError, "pop index out of range");
 		return NULL;
 	}
@@ -1053,7 +1053,7 @@ array_buffer_info(arrayobject *self, PyObject *unused)
 		return NULL;
 
 	PyTuple_SET_ITEM(retval, 0, PyLong_FromVoidPtr(self->ob_item));
-	PyTuple_SET_ITEM(retval, 1, PyInt_FromLong((long)(self->ob_size)));
+	PyTuple_SET_ITEM(retval, 1, PyInt_FromLong((long)(Py_Size(self))));
 
 	return retval;
 }
@@ -1070,7 +1070,7 @@ the buffer length in bytes.");
 static PyObject *
 array_append(arrayobject *self, PyObject *v)
 {
-	return ins(self, (int) self->ob_size, v);
+	return ins(self, (int) Py_Size(self), v);
 }
 
 PyDoc_STRVAR(append_doc,
@@ -1089,14 +1089,14 @@ array_byteswap(arrayobject *self, PyObject *unused)
 	case 1:
 		break;
 	case 2:
-		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 2) {
+		for (p = self->ob_item, i = Py_Size(self); --i >= 0; p += 2) {
 			char p0 = p[0];
 			p[0] = p[1];
 			p[1] = p0;
 		}
 		break;
 	case 4:
-		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 4) {
+		for (p = self->ob_item, i = Py_Size(self); --i >= 0; p += 4) {
 			char p0 = p[0];
 			char p1 = p[1];
 			p[0] = p[3];
@@ -1106,7 +1106,7 @@ array_byteswap(arrayobject *self, PyObject *unused)
 		}
 		break;
 	case 8:
-		for (p = self->ob_item, i = self->ob_size; --i >= 0; p += 8) {
+		for (p = self->ob_item, i = Py_Size(self); --i >= 0; p += 8) {
 			char p0 = p[0];
 			char p1 = p[1];
 			char p2 = p[2];
@@ -1147,16 +1147,16 @@ array_reduce(arrayobject *array)
 		dict = Py_None;
 		Py_INCREF(dict);
 	}
-	if (array->ob_size > 0) {
+	if (Py_Size(array) > 0) {
 		result = Py_BuildValue("O(cs#)O", 
-			array->ob_type, 
+			Py_Type(array), 
 			array->ob_descr->typecode,
 			array->ob_item,
-			array->ob_size * array->ob_descr->itemsize,
+			Py_Size(array) * array->ob_descr->itemsize,
 			dict);
 	} else {
 		result = Py_BuildValue("O(c)O", 
-			array->ob_type, 
+			Py_Type(array), 
 			array->ob_descr->typecode,
 			dict);
 	}
@@ -1175,9 +1175,9 @@ array_reverse(arrayobject *self, PyObject *unused)
 	char tmp[256];	/* 8 is probably enough -- but why skimp */
 	assert((size_t)itemsize <= sizeof(tmp));
 
-	if (self->ob_size > 1) {
+	if (Py_Size(self) > 1) {
 		for (p = self->ob_item,
-		     q = self->ob_item + (self->ob_size - 1)*itemsize;
+		     q = self->ob_item + (Py_Size(self) - 1)*itemsize;
 		     p < q;
 		     p += itemsize, q -= itemsize) {
 			/* memory areas guaranteed disjoint, so memcpy
@@ -1218,7 +1218,7 @@ array_fromfile(arrayobject *self, PyObject *args)
 		Py_ssize_t newlength;
 		size_t newbytes;
 		/* Be careful here about overflow */
-		if ((newlength = self->ob_size + n) <= 0 ||
+		if ((newlength = Py_Size(self) + n) <= 0 ||
 		    (newbytes = newlength * itemsize) / itemsize !=
 		    (size_t)newlength)
 			goto nomem;
@@ -1229,15 +1229,15 @@ array_fromfile(arrayobject *self, PyObject *args)
 			return NULL;
 		}
 		self->ob_item = item;
-		self->ob_size += n;
-		self->allocated = self->ob_size;
-		nread = fread(item + (self->ob_size - n) * itemsize,
+		Py_Size(self) += n;
+		self->allocated = Py_Size(self);
+		nread = fread(item + (Py_Size(self) - n) * itemsize,
 			      itemsize, n, fp);
 		if (nread < (size_t)n) {
-		  self->ob_size -= (n - nread);
-			PyMem_RESIZE(item, char, self->ob_size*itemsize);
+		  Py_Size(self) -= (n - nread);
+			PyMem_RESIZE(item, char, Py_Size(self)*itemsize);
 			self->ob_item = item;
-			self->allocated = self->ob_size;
+			self->allocated = Py_Size(self);
 			PyErr_SetString(PyExc_EOFError,
 				         "not enough items in file");
 			return NULL;
@@ -1297,23 +1297,23 @@ array_fromlist(arrayobject *self, PyObject *list)
 	if (n > 0) {
 		char *item = self->ob_item;
 		Py_ssize_t i;
-		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
+		PyMem_RESIZE(item, char, (Py_Size(self) + n) * itemsize);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return NULL;
 		}
 		self->ob_item = item;
-		self->ob_size += n;
-		self->allocated = self->ob_size;
+		Py_Size(self) += n;
+		self->allocated = Py_Size(self);
 		for (i = 0; i < n; i++) {
 			PyObject *v = PyList_GetItem(list, i);
 			if ((*self->ob_descr->setitem)(self,
-					self->ob_size - n + i, v) != 0) {
-				self->ob_size -= n;
+					Py_Size(self) - n + i, v) != 0) {
+				Py_Size(self) -= n;
 				PyMem_RESIZE(item, char,
-					          self->ob_size * itemsize);
+					          Py_Size(self) * itemsize);
 				self->ob_item = item;
-				self->allocated = self->ob_size;
+				self->allocated = Py_Size(self);
 				return NULL;
 			}
 		}
@@ -1331,12 +1331,12 @@ Append items to array from list.");
 static PyObject *
 array_tolist(arrayobject *self, PyObject *unused)
 {
-	PyObject *list = PyList_New(self->ob_size);
+	PyObject *list = PyList_New(Py_Size(self));
 	Py_ssize_t i;
 
 	if (list == NULL)
 		return NULL;
-	for (i = 0; i < self->ob_size; i++) {
+	for (i = 0; i < Py_Size(self); i++) {
 		PyObject *v = getarrayitem((PyObject *)self, i);
 		if (v == NULL) {
 			Py_DECREF(list);
@@ -1369,15 +1369,15 @@ array_fromstring(arrayobject *self, PyObject *args)
 	n = n / itemsize;
 	if (n > 0) {
 		char *item = self->ob_item;
-		PyMem_RESIZE(item, char, (self->ob_size + n) * itemsize);
+		PyMem_RESIZE(item, char, (Py_Size(self) + n) * itemsize);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return NULL;
 		}
 		self->ob_item = item;
-		self->ob_size += n;
-		self->allocated = self->ob_size;
-		memcpy(item + (self->ob_size - n) * itemsize,
+		Py_Size(self) += n;
+		self->allocated = Py_Size(self);
+		memcpy(item + (Py_Size(self) - n) * itemsize,
 		       str, itemsize*n);
 	}
 	Py_INCREF(Py_None);
@@ -1395,7 +1395,7 @@ static PyObject *
 array_tostring(arrayobject *self, PyObject *unused)
 {
 	return PyString_FromStringAndSize(self->ob_item,
-				    self->ob_size * self->ob_descr->itemsize);
+				    Py_Size(self) * self->ob_descr->itemsize);
 }
 
 PyDoc_STRVAR(tostring_doc,
@@ -1423,15 +1423,15 @@ array_fromunicode(arrayobject *self, PyObject *args)
 	}
 	if (n > 0) {
 		Py_UNICODE *item = (Py_UNICODE *) self->ob_item;
-		PyMem_RESIZE(item, Py_UNICODE, self->ob_size + n);
+		PyMem_RESIZE(item, Py_UNICODE, Py_Size(self) + n);
 		if (item == NULL) {
 			PyErr_NoMemory();
 			return NULL;
 		}
 		self->ob_item = (char *) item;
-		self->ob_size += n;
-		self->allocated = self->ob_size;
-		memcpy(item + self->ob_size - n,
+		Py_Size(self) += n;
+		self->allocated = Py_Size(self);
+		memcpy(item + Py_Size(self) - n,
 		       ustr, n * sizeof(Py_UNICODE));
 	}
 
@@ -1456,7 +1456,7 @@ array_tounicode(arrayobject *self, PyObject *unused)
 			"tounicode() may only be called on type 'u' arrays");
 		return NULL;
 	}
-	return PyUnicode_FromUnicode((Py_UNICODE *) self->ob_item, self->ob_size);
+	return PyUnicode_FromUnicode((Py_UNICODE *) self->ob_item, Py_Size(self));
 }
 
 PyDoc_STRVAR(tounicode_doc,
@@ -1554,7 +1554,7 @@ array_repr(arrayobject *a)
 	PyObject *s, *t, *v = NULL;
 	Py_ssize_t len;
 
-	len = a->ob_size;
+	len = Py_Size(a);
 	typecode = a->ob_descr->typecode;
 	if (len == 0) {
 		PyOS_snprintf(buf, sizeof(buf), "array('%c')", typecode);
@@ -1588,7 +1588,7 @@ array_subscr(arrayobject* self, PyObject* item)
 			return NULL;
 		}
 		if (i < 0)
-			i += self->ob_size;
+			i += Py_Size(self);
 		return array_item(self, i);
 	}
 	else if (PySlice_Check(item)) {
@@ -1597,7 +1597,7 @@ array_subscr(arrayobject* self, PyObject* item)
 		arrayobject* ar;
 		int itemsize = self->ob_descr->itemsize;
 
-		if (PySlice_GetIndicesEx((PySliceObject*)item, self->ob_size,
+		if (PySlice_GetIndicesEx((PySliceObject*)item, Py_Size(self),
 				 &start, &stop, &step, &slicelength) < 0) {
 			return NULL;
 		}
@@ -1636,14 +1636,14 @@ array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
 		if (i==-1 && PyErr_Occurred()) 
 			return -1;
 		if (i < 0)
-			i += self->ob_size;
+			i += Py_Size(self);
 		return array_ass_item(self, i, value);
 	}
 	else if (PySlice_Check(item)) {
 		Py_ssize_t start, stop, step, slicelength;
 		int itemsize = self->ob_descr->itemsize;
 
-		if (PySlice_GetIndicesEx((PySliceObject*)item, self->ob_size,
+		if (PySlice_GetIndicesEx((PySliceObject*)item, Py_Size(self),
 				 &start, &stop, &step, &slicelength) < 0) {
 			return -1;
 		}
@@ -1671,17 +1671,17 @@ array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
 					self->ob_item + (cur + 1)*itemsize,
 					(step - 1) * itemsize);
 			}
-			extra = self->ob_size - (cur + 1);
+			extra = Py_Size(self) - (cur + 1);
 			if (extra > 0) {
 				memmove(self->ob_item + (cur - i)*itemsize,
 					self->ob_item + (cur + 1)*itemsize,
 					extra*itemsize);
 			}
 
-			self->ob_size -= slicelength;
+			Py_Size(self) -= slicelength;
 			self->ob_item = (char *)PyMem_REALLOC(self->ob_item,
-							      itemsize*self->ob_size);
-			self->allocated = self->ob_size;
+							      itemsize*Py_Size(self));
+			self->allocated = Py_Size(self);
 
 			return 0;
 		}
@@ -1693,16 +1693,16 @@ array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
 			if (!array_Check(value)) {
 				PyErr_Format(PyExc_TypeError,
 			     "must assign array (not \"%.200s\") to slice",
-					     value->ob_type->tp_name);
+					     Py_Type(value)->tp_name);
 				return -1;
 			}
 
 			av = (arrayobject*)value;
 
-			if (av->ob_size != slicelength) {
+			if (Py_Size(av) != slicelength) {
 				PyErr_Format(PyExc_ValueError,
             "attempt to assign array of size %ld to extended slice of size %ld",
-					     /*XXX*/(long)av->ob_size, /*XXX*/(long)slicelength);
+					     /*XXX*/(long)Py_Size(av), /*XXX*/(long)slicelength);
 				return -1;
 			}
 
@@ -1711,7 +1711,7 @@ array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
 
 			/* protect against a[::-1] = a */
 			if (self == av) { 
-				value = array_slice(av, 0, av->ob_size);
+				value = array_slice(av, 0, Py_Size(av));
 				av = (arrayobject*)value;
 				if (!av)
 					return -1;
@@ -1758,7 +1758,7 @@ array_buffer_getreadbuf(arrayobject *self, Py_ssize_t index, const void **ptr)
 	*ptr = (void *)self->ob_item;
 	if (*ptr == NULL)
 		*ptr = emptybuf;
-	return self->ob_size*self->ob_descr->itemsize;
+	return Py_Size(self)*self->ob_descr->itemsize;
 }
 
 static Py_ssize_t
@@ -1772,14 +1772,14 @@ array_buffer_getwritebuf(arrayobject *self, Py_ssize_t index, const void **ptr)
 	*ptr = (void *)self->ob_item;
 	if (*ptr == NULL)
 		*ptr = emptybuf;
-	return self->ob_size*self->ob_descr->itemsize;
+	return Py_Size(self)*self->ob_descr->itemsize;
 }
 
 static Py_ssize_t
 array_buffer_getsegcount(arrayobject *self, Py_ssize_t *lenp)
 {
 	if ( lenp )
-		*lenp = self->ob_size*self->ob_descr->itemsize;
+		*lenp = Py_Size(self)*self->ob_descr->itemsize;
 	return 1;
 }
 
@@ -1888,9 +1888,9 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 						return NULL;
 					}
 					self->ob_item = item;
-					self->ob_size = n / sizeof(Py_UNICODE);
+					Py_Size(self) = n / sizeof(Py_UNICODE);
 					memcpy(item, PyUnicode_AS_DATA(initial), n);
-					self->allocated = self->ob_size;
+					self->allocated = Py_Size(self);
 				}
 #endif
 			}
@@ -1978,8 +1978,7 @@ itemsize -- the length in bytes of one array item\n\
 static PyObject *array_iter(arrayobject *ao);
 
 static PyTypeObject Arraytype = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"array.array",
 	sizeof(arrayobject),
 	0,
@@ -2060,7 +2059,7 @@ static PyObject *
 arrayiter_next(arrayiterobject *it)
 {
 	assert(PyArrayIter_Check(it));
-	if (it->index < it->ao->ob_size)
+	if (it->index < Py_Size(it->ao))
 		return (*it->getitem)(it->ao, it->index++);
 	return NULL;
 }
@@ -2081,8 +2080,7 @@ arrayiter_traverse(arrayiterobject *it, visitproc visit, void *arg)
 }
 
 static PyTypeObject PyArrayIter_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,                                      /* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"arrayiterator",                        /* tp_name */
 	sizeof(arrayiterobject),                /* tp_basicsize */
 	0,                                      /* tp_itemsize */
diff --git a/Modules/bz2module.c b/Modules/bz2module.c
index 9d92cf6..053461f 100644
--- a/Modules/bz2module.c
+++ b/Modules/bz2module.c
@@ -41,7 +41,7 @@ typedef fpos_t Py_off_t;
 #define MODE_READ_EOF 2
 #define MODE_WRITE    3
 
-#define BZ2FileObject_Check(v)	((v)->ob_type == &BZ2File_Type)
+#define BZ2FileObject_Check(v)	(Py_Type(v) == &BZ2File_Type)
 
 
 #ifdef BZ_CONFIG_ERROR
@@ -1418,7 +1418,7 @@ BZ2File_dealloc(BZ2FileObject *self)
 	}
 	Util_DropReadAhead(self);
 	Py_XDECREF(self->file);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 /* This is a hacked version of Python's fileobject.c:file_getiter(). */
@@ -1480,8 +1480,7 @@ newlines are available only when reading.\n\
 ;
 
 static PyTypeObject BZ2File_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"bz2.BZ2File",		/*tp_name*/
 	sizeof(BZ2FileObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -1735,7 +1734,7 @@ BZ2Comp_dealloc(BZ2CompObject *self)
 		PyThread_free_lock(self->lock);
 #endif
 	BZ2_bzCompressEnd(&self->bzs);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 
@@ -1752,8 +1751,7 @@ must be a number between 1 and 9.\n\
 ");
 
 static PyTypeObject BZ2Comp_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"bz2.BZ2Compressor",	/*tp_name*/
 	sizeof(BZ2CompObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -1958,7 +1956,7 @@ BZ2Decomp_dealloc(BZ2DecompObject *self)
 #endif
 	Py_XDECREF(self->unused_data);
 	BZ2_bzDecompressEnd(&self->bzs);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 
@@ -1974,8 +1972,7 @@ decompress() function instead.\n\
 ");
 
 static PyTypeObject BZ2Decomp_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"bz2.BZ2Decompressor",	/*tp_name*/
 	sizeof(BZ2DecompObject), /*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -2209,9 +2206,9 @@ initbz2(void)
 {
 	PyObject *m;
 
-	BZ2File_Type.ob_type = &PyType_Type;
-	BZ2Comp_Type.ob_type = &PyType_Type;
-	BZ2Decomp_Type.ob_type = &PyType_Type;
+	Py_Type(&BZ2File_Type) = &PyType_Type;
+	Py_Type(&BZ2Comp_Type) = &PyType_Type;
+	Py_Type(&BZ2Decomp_Type) = &PyType_Type;
 
 	m = Py_InitModule3("bz2", bz2_methods, bz2__doc__);
 	if (m == NULL)
diff --git a/Modules/cPickle.c b/Modules/cPickle.c
index dd9887b..fbf6a12 100644
--- a/Modules/cPickle.c
+++ b/Modules/cPickle.c
@@ -151,12 +151,12 @@ Pdata_dealloc(Pdata *self)
 }
 
 static PyTypeObject PdataType = {
-	PyObject_HEAD_INIT(NULL) 0, "cPickle.Pdata", sizeof(Pdata), 0,
+	PyVarObject_HEAD_INIT(NULL, 0) "cPickle.Pdata", sizeof(Pdata), 0,
 	(destructor)Pdata_dealloc,
 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0L,0L,0L,0L, ""
 };
 
-#define Pdata_Check(O) ((O)->ob_type == &PdataType)
+#define Pdata_Check(O) (Py_Type(O) == &PdataType)
 
 static PyObject *
 Pdata_New(void)
@@ -316,7 +316,7 @@ Pdata_popList(Pdata *self, int start)
 }
 
 #define FREE_ARG_TUP(self) {                        \
-    if (self->arg->ob_refcnt > 1) {                 \
+    if (Py_Refcnt(self->arg) > 1) {                 \
       Py_DECREF(self->arg);                         \
       self->arg=NULL;                               \
     }                                               \
@@ -752,7 +752,7 @@ get(Picklerobject *self, PyObject *id)
 static int
 put(Picklerobject *self, PyObject *ob)
 {
-	if (ob->ob_refcnt < 2 || self->fast)
+	if (Py_Refcnt(ob) < 2 || self->fast)
 		return 0;
 
 	return put2(self, ob);
@@ -916,7 +916,7 @@ fast_save_enter(Picklerobject *self, PyObject *obj)
 			PyErr_Format(PyExc_ValueError,
 				     "fast mode: can't pickle cyclic objects "
 				     "including object type %s at %p",
-				     obj->ob_type->tp_name, obj);
+				     Py_Type(obj)->tp_name, obj);
 			self->fast_container = -1;
 			return 0;
 		}
@@ -2320,7 +2320,7 @@ save(Picklerobject *self, PyObject *args, int pers_save)
 		goto finally;
 	}
 
-	type = args->ob_type;
+	type = Py_Type(args);
 
 	switch (type->tp_name[0]) {
 	case 'b':
@@ -2372,7 +2372,7 @@ save(Picklerobject *self, PyObject *args, int pers_save)
 #endif
 	}
 
-	if (args->ob_refcnt > 1) {
+	if (Py_Refcnt(args) > 1) {
 		if (!( py_ob_id = PyLong_FromVoidPtr(args)))
 			goto finally;
 
@@ -2913,7 +2913,7 @@ Pickler_dealloc(Picklerobject *self)
 	Py_XDECREF(self->inst_pers_func);
 	Py_XDECREF(self->dispatch_table);
 	PyMem_Free(self->write_buf);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static int
@@ -3037,8 +3037,7 @@ PyDoc_STRVAR(Picklertype__doc__,
 "Objects that know how to pickle objects\n");
 
 static PyTypeObject Picklertype = {
-    PyObject_HEAD_INIT(NULL)
-    0,                            /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "cPickle.Pickler",            /*tp_name*/
     sizeof(Picklerobject),              /*tp_basicsize*/
     0,
@@ -5254,7 +5253,7 @@ Unpickler_dealloc(Unpicklerobject *self)
 		free(self->buf);
 	}
 
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static int
@@ -5483,8 +5482,7 @@ PyDoc_STRVAR(Unpicklertype__doc__,
 "Objects that know how to unpickle");
 
 static PyTypeObject Unpicklertype = {
-    PyObject_HEAD_INIT(NULL)
-    0,                          	 /*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "cPickle.Unpickler", 	         /*tp_name*/
     sizeof(Unpicklerobject),             /*tp_basicsize*/
     0,
@@ -5708,9 +5706,9 @@ initcPickle(void)
 	PyObject *format_version;
 	PyObject *compatible_formats;
 
-	Picklertype.ob_type = &PyType_Type;
-	Unpicklertype.ob_type = &PyType_Type;
-	PdataType.ob_type = &PyType_Type;
+	Py_Type(&Picklertype) = &PyType_Type;
+	Py_Type(&Unpicklertype) = &PyType_Type;
+	Py_Type(&PdataType) = &PyType_Type;
 
 	/* Initialize some pieces. We need to do this before module creation,
 	 * so we're forced to use a temporary dictionary. :(
diff --git a/Modules/cStringIO.c b/Modules/cStringIO.c
index 2085696..5834e20 100644
--- a/Modules/cStringIO.c
+++ b/Modules/cStringIO.c
@@ -514,8 +514,7 @@ O_dealloc(Oobject *self) {
 PyDoc_STRVAR(Otype__doc__, "Simple type for output to strings.");
 
 static PyTypeObject Otype = {
-  PyObject_HEAD_INIT(NULL)
-  0,	       			/*ob_size*/
+  PyVarObject_HEAD_INIT(NULL, 0)
   "cStringIO.StringO",   	/*tp_name*/
   sizeof(Oobject),       	/*tp_basicsize*/
   0,	       			/*tp_itemsize*/
@@ -635,8 +634,7 @@ PyDoc_STRVAR(Itype__doc__,
 "Simple type for treating strings as input file streams");
 
 static PyTypeObject Itype = {
-  PyObject_HEAD_INIT(NULL)
-  0,					/*ob_size*/
+  PyVarObject_HEAD_INIT(NULL, 0)
   "cStringIO.StringI",			/*tp_name*/
   sizeof(Iobject),			/*tp_basicsize*/
   0,					/*tp_itemsize*/
@@ -746,8 +744,8 @@ initcStringIO(void) {
   d = PyModule_GetDict(m);
   
   /* Export C API */
-  Itype.ob_type=&PyType_Type;
-  Otype.ob_type=&PyType_Type;
+  Py_Type(&Itype)=&PyType_Type;
+  Py_Type(&Otype)=&PyType_Type;
   if (PyType_Ready(&Otype) < 0) return;
   if (PyType_Ready(&Itype) < 0) return;
   PyDict_SetItemString(d,"cStringIO_CAPI",
diff --git a/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 9fb9570..cde8822 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -670,8 +670,7 @@ multibytecodec_dealloc(MultibyteCodecObject *self)
 }
 
 static PyTypeObject MultibyteCodec_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteCodec",		/* tp_name */
 	sizeof(MultibyteCodecObject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -946,12 +945,11 @@ mbiencoder_dealloc(MultibyteIncrementalEncoderObject *self)
 {
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyTypeObject MultibyteIncrementalEncoder_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteIncrementalEncoder",	/* tp_name */
 	sizeof(MultibyteIncrementalEncoderObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1147,12 +1145,11 @@ mbidecoder_dealloc(MultibyteIncrementalDecoderObject *self)
 {
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyTypeObject MultibyteIncrementalDecoder_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteIncrementalDecoder",	/* tp_name */
 	sizeof(MultibyteIncrementalDecoderObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1464,12 +1461,11 @@ mbstreamreader_dealloc(MultibyteStreamReaderObject *self)
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
 	Py_DECREF(self->stream);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static PyTypeObject MultibyteStreamReader_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteStreamReader",	/* tp_name */
 	sizeof(MultibyteStreamReaderObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1667,7 +1663,7 @@ mbstreamwriter_dealloc(MultibyteStreamWriterObject *self)
 	PyObject_GC_UnTrack(self);
 	ERROR_DECREF(self->errors);
 	Py_DECREF(self->stream);
-	self->ob_type->tp_free(self);
+	Py_Type(self)->tp_free(self);
 }
 
 static struct PyMethodDef mbstreamwriter_methods[] = {
@@ -1688,8 +1684,7 @@ static PyMemberDef mbstreamwriter_members[] = {
 };
 
 static PyTypeObject MultibyteStreamWriter_Type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"MultibyteStreamWriter",	/* tp_name */
 	sizeof(MultibyteStreamWriterObject), /* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/datetimemodule.c b/Modules/datetimemodule.c
index 026319a..4113e84 100644
--- a/Modules/datetimemodule.c
+++ b/Modules/datetimemodule.c
@@ -764,7 +764,7 @@ check_tzinfo_subclass(PyObject *p)
 	PyErr_Format(PyExc_TypeError,
 		     "tzinfo argument must be None or of a tzinfo subclass, "
 		     "not type '%s'",
-		     p->ob_type->tp_name);
+		     Py_Type(p)->tp_name);
 	return -1;
 }
 
@@ -855,7 +855,7 @@ call_utc_tzinfo_method(PyObject *tzinfo, char *name, PyObject *tzinfoarg,
 		PyErr_Format(PyExc_TypeError,
 			     "tzinfo.%s() must return None or "
 			     "timedelta, not '%s'",
-			     name, u->ob_type->tp_name);
+			     name, Py_Type(u)->tp_name);
 	}
 
 	Py_DECREF(u);
@@ -948,7 +948,7 @@ call_tzname(PyObject *tzinfo, PyObject *tzinfoarg)
 	if (result != NULL && result != Py_None && ! PyString_Check(result)) {
 		PyErr_Format(PyExc_TypeError, "tzinfo.tzname() must "
 			     "return None or a string, not '%s'",
-			     result->ob_type->tp_name);
+			     Py_Type(result)->tp_name);
 		Py_DECREF(result);
 		result = NULL;
 	}
@@ -1421,7 +1421,7 @@ cmperror(PyObject *a, PyObject *b)
 {
 	PyErr_Format(PyExc_TypeError,
 		     "can't compare %s to %s",
-		     a->ob_type->tp_name, b->ob_type->tp_name);
+		     Py_Type(a)->tp_name, Py_Type(b)->tp_name);
 	return NULL;
 }
 
@@ -1876,7 +1876,7 @@ accum(const char* tag, PyObject *sofar, PyObject *num, PyObject *factor,
 
 	PyErr_Format(PyExc_TypeError,
 		     "unsupported type for timedelta %s component: %s",
-		     tag, num->ob_type->tp_name);
+		     tag, Py_Type(num)->tp_name);
 	return NULL;
 }
 
@@ -1980,18 +1980,18 @@ delta_repr(PyDateTime_Delta *self)
 {
 	if (GET_TD_MICROSECONDS(self) != 0)
 		return PyString_FromFormat("%s(%d, %d, %d)",
-					   self->ob_type->tp_name,
+					   Py_Type(self)->tp_name,
 					   GET_TD_DAYS(self),
 					   GET_TD_SECONDS(self),
 					   GET_TD_MICROSECONDS(self));
 	if (GET_TD_SECONDS(self) != 0)
 		return PyString_FromFormat("%s(%d, %d)",
-					   self->ob_type->tp_name,
+					   Py_Type(self)->tp_name,
 					   GET_TD_DAYS(self),
 					   GET_TD_SECONDS(self));
 
 	return PyString_FromFormat("%s(%d)",
-				   self->ob_type->tp_name,
+				   Py_Type(self)->tp_name,
 				   GET_TD_DAYS(self));
 }
 
@@ -2055,7 +2055,7 @@ delta_getstate(PyDateTime_Delta *self)
 static PyObject *
 delta_reduce(PyDateTime_Delta* self)
 {
-	return Py_BuildValue("ON", self->ob_type, delta_getstate(self));
+	return Py_BuildValue("ON", Py_Type(self), delta_getstate(self));
 }
 
 #define OFFSET(field)  offsetof(PyDateTime_Delta, field)
@@ -2125,8 +2125,7 @@ static PyNumberMethods delta_as_number = {
 };
 
 static PyTypeObject PyDateTime_DeltaType = {
-	PyObject_HEAD_INIT(NULL)
-	0,						/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"datetime.timedelta",				/* tp_name */
 	sizeof(PyDateTime_Delta),			/* tp_basicsize */
 	0,						/* tp_itemsize */
@@ -2415,7 +2414,7 @@ date_repr(PyDateTime_Date *self)
 	char buffer[1028];
 	const char *type_name;
 
-	type_name = self->ob_type->tp_name;
+	type_name = Py_Type(self)->tp_name;
 	PyOS_snprintf(buffer, sizeof(buffer), "%s(%d, %d, %d)",
 		      type_name,
 		      GET_YEAR(self), GET_MONTH(self), GET_DAY(self));
@@ -2555,7 +2554,7 @@ date_replace(PyDateTime_Date *self, PyObject *args, PyObject *kw)
 	tuple = Py_BuildValue("iii", year, month, day);
 	if (tuple == NULL)
 		return NULL;
-	clone = date_new(self->ob_type, tuple, NULL);
+	clone = date_new(Py_Type(self), tuple, NULL);
 	Py_DECREF(tuple);
 	return clone;
 }
@@ -2605,7 +2604,7 @@ date_getstate(PyDateTime_Date *self)
 static PyObject *
 date_reduce(PyDateTime_Date *self, PyObject *arg)
 {
-	return Py_BuildValue("(ON)", self->ob_type, date_getstate(self));
+	return Py_BuildValue("(ON)", Py_Type(self), date_getstate(self));
 }
 
 static PyMethodDef date_methods[] = {
@@ -2683,8 +2682,7 @@ static PyNumberMethods date_as_number = {
 };
 
 static PyTypeObject PyDateTime_DateType = {
-	PyObject_HEAD_INIT(NULL)
-	0,						/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"datetime.date",				/* tp_name */
 	sizeof(PyDateTime_Date),			/* tp_basicsize */
 	0,						/* tp_itemsize */
@@ -2908,10 +2906,10 @@ tzinfo_reduce(PyObject *self)
 
 	if (state == Py_None) {
 		Py_DECREF(state);
-		return Py_BuildValue("(ON)", self->ob_type, args);
+		return Py_BuildValue("(ON)", Py_Type(self), args);
 	}
 	else
-		return Py_BuildValue("(ONN)", self->ob_type, args, state);
+		return Py_BuildValue("(ONN)", Py_Type(self), args, state);
 }
 
 static PyMethodDef tzinfo_methods[] = {
@@ -3106,7 +3104,7 @@ time_dealloc(PyDateTime_Time *self)
 	if (HASTZINFO(self)) {
 		Py_XDECREF(self->tzinfo);
 	}
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 /*
@@ -3140,7 +3138,7 @@ static PyObject *
 time_repr(PyDateTime_Time *self)
 {
 	char buffer[100];
-	const char *type_name = self->ob_type->tp_name;
+	const char *type_name = Py_Type(self)->tp_name;
 	int h = TIME_GET_HOUR(self);
 	int m = TIME_GET_MINUTE(self);
 	int s = TIME_GET_SECOND(self);
@@ -3354,7 +3352,7 @@ time_replace(PyDateTime_Time *self, PyObject *args, PyObject *kw)
 	tuple = Py_BuildValue("iiiiO", hh, mm, ss, us, tzinfo);
 	if (tuple == NULL)
 		return NULL;
-	clone = time_new(self->ob_type, tuple, NULL);
+	clone = time_new(Py_Type(self), tuple, NULL);
 	Py_DECREF(tuple);
 	return clone;
 }
@@ -3408,7 +3406,7 @@ time_getstate(PyDateTime_Time *self)
 static PyObject *
 time_reduce(PyDateTime_Time *self, PyObject *arg)
 {
-	return Py_BuildValue("(ON)", self->ob_type, time_getstate(self));
+	return Py_BuildValue("(ON)", Py_Type(self), time_getstate(self));
 }
 
 static PyMethodDef time_methods[] = {
@@ -3902,7 +3900,7 @@ datetime_dealloc(PyDateTime_DateTime *self)
 	if (HASTZINFO(self)) {
 		Py_XDECREF(self->tzinfo);
 	}
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 /*
@@ -4051,7 +4049,7 @@ static PyObject *
 datetime_repr(PyDateTime_DateTime *self)
 {
 	char buffer[1000];
-	const char *type_name = self->ob_type->tp_name;
+	const char *type_name = Py_Type(self)->tp_name;
 	PyObject *baserepr;
 
 	if (DATE_GET_MICROSECOND(self)) {
@@ -4272,7 +4270,7 @@ datetime_replace(PyDateTime_DateTime *self, PyObject *args, PyObject *kw)
 	tuple = Py_BuildValue("iiiiiiiO", y, m, d, hh, mm, ss, us, tzinfo);
 	if (tuple == NULL)
 		return NULL;
-	clone = datetime_new(self->ob_type, tuple, NULL);
+	clone = datetime_new(Py_Type(self), tuple, NULL);
 	Py_DECREF(tuple);
 	return clone;
 }
@@ -4460,7 +4458,7 @@ datetime_getstate(PyDateTime_DateTime *self)
 static PyObject *
 datetime_reduce(PyDateTime_DateTime *self, PyObject *arg)
 {
-	return Py_BuildValue("(ON)", self->ob_type, datetime_getstate(self));
+	return Py_BuildValue("(ON)", Py_Type(self), datetime_getstate(self));
 }
 
 static PyMethodDef datetime_methods[] = {
diff --git a/Modules/dbmmodule.c b/Modules/dbmmodule.c
index fa1fde2..ae5eae6 100644
--- a/Modules/dbmmodule.c
+++ b/Modules/dbmmodule.c
@@ -36,7 +36,7 @@ typedef struct {
 
 static PyTypeObject Dbmtype;
 
-#define is_dbmobject(v) ((v)->ob_type == &Dbmtype)
+#define is_dbmobject(v) (Py_Type(v) == &Dbmtype)
 #define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
                { PyErr_SetString(DbmError, "DBM object has already been closed"); \
                  return NULL; }
@@ -302,8 +302,7 @@ dbm_getattr(dbmobject *dp, char *name)
 }
 
 static PyTypeObject Dbmtype = {
-	PyObject_HEAD_INIT(NULL)
-	0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"dbm.dbm",
 	sizeof(dbmobject),
 	0,
diff --git a/Modules/dlmodule.c b/Modules/dlmodule.c
index 5622ed9..63e25c7 100644
--- a/Modules/dlmodule.c
+++ b/Modules/dlmodule.c
@@ -62,7 +62,7 @@ dl_sym(dlobject *xp, PyObject *args)
 		name = PyString_AS_STRING(args);
 	} else {
 		PyErr_Format(PyExc_TypeError, "expected string, found %.200s",
-			     args->ob_type->tp_name);
+			     Py_Type(args)->tp_name);
 		return NULL;
 	}
 	func = dlsym(xp->dl_handle, name);
@@ -141,8 +141,7 @@ dl_getattr(dlobject *xp, char *name)
 
 
 static PyTypeObject Dltype = {
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"dl.dl",		/*tp_name*/
 	sizeof(dlobject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -237,7 +236,7 @@ initdl(void)
 	PyObject *m, *d, *x;
 
 	/* Initialize object type */
-	Dltype.ob_type = &PyType_Type;
+	Py_Type(&Dltype) = &PyType_Type;
 
 	/* Create the module and add the functions */
 	m = Py_InitModule("dl", dl_methods);
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index 6c5011c..b6a871b 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -239,7 +239,7 @@ update_refs(PyGC_Head *containers)
 	PyGC_Head *gc = containers->gc.gc_next;
 	for (; gc != containers; gc = gc->gc.gc_next) {
 		assert(gc->gc.gc_refs == GC_REACHABLE);
-		gc->gc.gc_refs = FROM_GC(gc)->ob_refcnt;
+		gc->gc.gc_refs = Py_Refcnt(FROM_GC(gc));
 		/* Python's cyclic gc should never see an incoming refcount
 		 * of 0:  if something decref'ed to 0, it should have been
 		 * deallocated immediately at that time.
@@ -291,7 +291,7 @@ subtract_refs(PyGC_Head *containers)
 	traverseproc traverse;
 	PyGC_Head *gc = containers->gc.gc_next;
 	for (; gc != containers; gc=gc->gc.gc_next) {
-		traverse = FROM_GC(gc)->ob_type->tp_traverse;
+		traverse = Py_Type(FROM_GC(gc))->tp_traverse;
 		(void) traverse(FROM_GC(gc),
 			       (visitproc)visit_decref,
 			       NULL);
@@ -376,7 +376,7 @@ move_unreachable(PyGC_Head *young, PyGC_Head *unreachable)
                          * the next object to visit.
                          */
                         PyObject *op = FROM_GC(gc);
-                        traverseproc traverse = op->ob_type->tp_traverse;
+                        traverseproc traverse = Py_Type(op)->tp_traverse;
                         assert(gc->gc.gc_refs > 0);
                         gc->gc.gc_refs = GC_REACHABLE;
                         (void) traverse(op,
@@ -472,7 +472,7 @@ move_finalizer_reachable(PyGC_Head *finalizers)
 	PyGC_Head *gc = finalizers->gc.gc_next;
 	for (; gc != finalizers; gc = gc->gc.gc_next) {
 		/* Note that the finalizers list may grow during this. */
-		traverse = FROM_GC(gc)->ob_type->tp_traverse;
+		traverse = Py_Type(FROM_GC(gc))->tp_traverse;
 		(void) traverse(FROM_GC(gc),
 				(visitproc)visit_move,
 				(void *)finalizers);
@@ -517,7 +517,7 @@ handle_weakrefs(PyGC_Head *unreachable, PyGC_Head *old)
 		assert(IS_TENTATIVELY_UNREACHABLE(op));
 		next = gc->gc.gc_next;
 
-		if (! PyType_SUPPORTS_WEAKREFS(op->ob_type))
+		if (! PyType_SUPPORTS_WEAKREFS(Py_Type(op)))
 			continue;
 
 		/* It supports weakrefs.  Does it have any? */
@@ -654,7 +654,7 @@ debug_cycle(char *msg, PyObject *op)
 	}
 	else if (debug & DEBUG_OBJECTS) {
 		PySys_WriteStderr("gc: %.100s <%.100s %p>\n",
-				  msg, op->ob_type->tp_name, op);
+				  msg, Py_Type(op)->tp_name, op);
 	}
 }
 
@@ -708,7 +708,7 @@ delete_garbage(PyGC_Head *collectable, PyGC_Head *old)
 			PyList_Append(garbage, op);
 		}
 		else {
-			if ((clear = op->ob_type->tp_clear) != NULL) {
+			if ((clear = Py_Type(op)->tp_clear) != NULL) {
 				Py_INCREF(op);
 				clear(op);
 				Py_DECREF(op);
@@ -1079,7 +1079,7 @@ gc_referrers_for(PyObject *objs, PyGC_Head *list, PyObject *resultlist)
 	traverseproc traverse;
 	for (gc = list->gc.gc_next; gc != list; gc = gc->gc.gc_next) {
 		obj = FROM_GC(gc);
-		traverse = obj->ob_type->tp_traverse;
+		traverse = Py_Type(obj)->tp_traverse;
 		if (obj == objs || obj == resultlist)
 			continue;
 		if (traverse(obj, (visitproc)referrersvisit, objs)) {
@@ -1136,7 +1136,7 @@ gc_get_referents(PyObject *self, PyObject *args)
 
 		if (! PyObject_IS_GC(obj))
 			continue;
-		traverse = obj->ob_type->tp_traverse;
+		traverse = Py_Type(obj)->tp_traverse;
 		if (! traverse)
 			continue;
 		if (traverse(obj, (visitproc)referentsvisit, result)) {
@@ -1359,13 +1359,13 @@ _PyObject_GC_NewVar(PyTypeObject *tp, Py_ssize_t nitems)
 PyVarObject *
 _PyObject_GC_Resize(PyVarObject *op, Py_ssize_t nitems)
 {
-	const size_t basicsize = _PyObject_VAR_SIZE(op->ob_type, nitems);
+	const size_t basicsize = _PyObject_VAR_SIZE(Py_Type(op), nitems);
 	PyGC_Head *g = AS_GC(op);
 	g = (PyGC_Head *)PyObject_REALLOC(g,  sizeof(PyGC_Head) + basicsize);
 	if (g == NULL)
 		return (PyVarObject *)PyErr_NoMemory();
 	op = (PyVarObject *) FROM_GC(g);
-	op->ob_size = nitems;
+	Py_Size(op) = nitems;
 	return op;
 }
 
diff --git a/Modules/gdbmmodule.c b/Modules/gdbmmodule.c
index cfc6abc..a522059 100644
--- a/Modules/gdbmmodule.c
+++ b/Modules/gdbmmodule.c
@@ -36,7 +36,7 @@ typedef struct {
 
 static PyTypeObject Dbmtype;
 
-#define is_dbmobject(v) ((v)->ob_type == &Dbmtype)
+#define is_dbmobject(v) (Py_Type(v) == &Dbmtype)
 #define check_dbmobject_open(v) if ((v)->di_dbm == NULL) \
     { PyErr_SetString(DbmError, "GDBM object has already been closed"); \
       return NULL; }
@@ -370,8 +370,7 @@ dbm_getattr(dbmobject *dp, char *name)
 }
 
 static PyTypeObject Dbmtype = {
-    PyObject_HEAD_INIT(0)
-    0,
+    PyVarObject_HEAD_INIT(0, 0)
     "gdbm.gdbm",
     sizeof(dbmobject),
     0,
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index 33172b6..35b77e7 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -59,7 +59,7 @@ groupby_dealloc(groupbyobject *gbo)
 	Py_XDECREF(gbo->tgtkey);
 	Py_XDECREF(gbo->currkey);
 	Py_XDECREF(gbo->currvalue);
-	gbo->ob_type->tp_free(gbo);
+	Py_Type(gbo)->tp_free(gbo);
 }
 
 static int
@@ -139,8 +139,7 @@ PyDoc_STRVAR(groupby_doc,
 (key, sub-iterator) grouped by each value of key(value).\n");
 
 static PyTypeObject groupby_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.groupby",		/* tp_name */
 	sizeof(groupbyobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -261,8 +260,7 @@ _grouper_next(_grouperobject *igo)
 }
 
 static PyTypeObject _grouper_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools._grouper",		/* tp_name */
 	sizeof(_grouperobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -415,8 +413,7 @@ teedataobject_dealloc(teedataobject *tdo)
 PyDoc_STRVAR(teedataobject_doc, "Data container common to multiple tee objects.");
 
 static PyTypeObject teedataobject_type = {
-	PyObject_HEAD_INIT(0)	/* Must fill in type value later */
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(0, 0)	/* Must fill in type value later */
 	"itertools.tee_dataobject",		/* tp_name */
 	sizeof(teedataobject),			/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -572,8 +569,7 @@ static PyMethodDef tee_methods[] = {
 };
 
 static PyTypeObject tee_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.tee",		/* tp_name */
 	sizeof(teeobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -718,7 +714,7 @@ cycle_dealloc(cycleobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->saved);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -768,8 +764,7 @@ Return elements from the iterable until it is exhausted.\n\
 Then repeat the sequence indefinitely.");
 
 static PyTypeObject cycle_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.cycle",		/* tp_name */
 	sizeof(cycleobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -862,7 +857,7 @@ dropwhile_dealloc(dropwhileobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -882,7 +877,7 @@ dropwhile_next(dropwhileobject *lz)
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	for (;;) {
 		item = iternext(it);
 		if (item == NULL)
@@ -912,8 +907,7 @@ Drop items from the iterable while predicate(item) is true.\n\
 Afterwards, return every element until the iterable is exhausted.");
 
 static PyTypeObject dropwhile_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.dropwhile",		/* tp_name */
 	sizeof(dropwhileobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1006,7 +1000,7 @@ takewhile_dealloc(takewhileobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1028,7 +1022,7 @@ takewhile_next(takewhileobject *lz)
 		return NULL;
 
 	assert(PyIter_Check(it));
-	item = (*it->ob_type->tp_iternext)(it);
+	item = (*Py_Type(it)->tp_iternext)(it);
 	if (item == NULL)
 		return NULL;
 
@@ -1053,8 +1047,7 @@ Return successive entries from an iterable as long as the \n\
 predicate evaluates to true for each entry.");
 
 static PyTypeObject takewhile_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.takewhile",		/* tp_name */
 	sizeof(takewhileobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1197,7 +1190,7 @@ islice_dealloc(isliceobject *lz)
 {
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1216,7 +1209,7 @@ islice_next(isliceobject *lz)
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	while (lz->cnt < lz->next) {
 		item = iternext(it);
 		if (item == NULL)
@@ -1249,8 +1242,7 @@ skipped between successive calls.  Works like a slice() on a list\n\
 but returns an iterator.");
 
 static PyTypeObject islice_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.islice",		/* tp_name */
 	sizeof(isliceobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1341,7 +1333,7 @@ starmap_dealloc(starmapobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1360,7 +1352,7 @@ starmap_next(starmapobject *lz)
 	PyObject *it = lz->it;
 
 	assert(PyIter_Check(it));
-	args = (*it->ob_type->tp_iternext)(it);
+	args = (*Py_Type(it)->tp_iternext)(it);
 	if (args == NULL)
 		return NULL;
 	if (!PyTuple_CheckExact(args)) {
@@ -1381,8 +1373,7 @@ 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 = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.starmap",		/* tp_name */
 	sizeof(starmapobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1487,7 +1478,7 @@ imap_dealloc(imapobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->iters);
 	Py_XDECREF(lz->func);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1561,8 +1552,7 @@ iterable is exhausted instead of filling in None for shorter\n\
 iterables.");
 
 static PyTypeObject imap_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.imap",		/* tp_name */
 	sizeof(imapobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1666,7 +1656,7 @@ chain_dealloc(chainobject *lz)
 {
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->ittuple);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1706,8 +1696,7 @@ first iterable until it is exhausted, then elements from the next\n\
 iterable, until all of the iterables are exhausted.");
 
 static PyTypeObject chain_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.chain",		/* tp_name */
 	sizeof(chainobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1798,7 +1787,7 @@ ifilter_dealloc(ifilterobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1818,7 +1807,7 @@ ifilter_next(ifilterobject *lz)
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	for (;;) {
 		item = iternext(it);
 		if (item == NULL)
@@ -1850,8 +1839,7 @@ 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 = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.ifilter",		/* tp_name */
 	sizeof(ifilterobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -1943,7 +1931,7 @@ ifilterfalse_dealloc(ifilterfalseobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->func);
 	Py_XDECREF(lz->it);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -1963,7 +1951,7 @@ ifilterfalse_next(ifilterfalseobject *lz)
 	PyObject *(*iternext)(PyObject *);
 
 	assert(PyIter_Check(it));
-	iternext = *it->ob_type->tp_iternext;
+	iternext = *Py_Type(it)->tp_iternext;
 	for (;;) {
 		item = iternext(it);
 		if (item == NULL)
@@ -1995,8 +1983,7 @@ 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 = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.ifilterfalse",	/* tp_name */
 	sizeof(ifilterfalseobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2094,8 +2081,7 @@ Return a count object whose .next() method returns consecutive\n\
 integers starting from zero or, if specified, from firstval.");
 
 static PyTypeObject count_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.count",		/* tp_name */
 	sizeof(countobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2214,7 +2200,7 @@ izip_dealloc(izipobject *lz)
 	PyObject_GC_UnTrack(lz);
 	Py_XDECREF(lz->ittuple);
 	Py_XDECREF(lz->result);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -2237,12 +2223,12 @@ izip_next(izipobject *lz)
 
 	if (tuplesize == 0)
 		return NULL;
-	if (result->ob_refcnt == 1) {
+	if (Py_Refcnt(result) == 1) {
 		Py_INCREF(result);
 		for (i=0 ; i < tuplesize ; i++) {
 			it = PyTuple_GET_ITEM(lz->ittuple, i);
 			assert(PyIter_Check(it));
-			item = (*it->ob_type->tp_iternext)(it);
+			item = (*Py_Type(it)->tp_iternext)(it);
 			if (item == NULL) {
 				Py_DECREF(result);
 				return NULL;
@@ -2258,7 +2244,7 @@ izip_next(izipobject *lz)
 		for (i=0 ; i < tuplesize ; i++) {
 			it = PyTuple_GET_ITEM(lz->ittuple, i);
 			assert(PyIter_Check(it));
-			item = (*it->ob_type->tp_iternext)(it);
+			item = (*Py_Type(it)->tp_iternext)(it);
 			if (item == NULL) {
 				Py_DECREF(result);
 				return NULL;
@@ -2280,8 +2266,7 @@ function but consumes less memory by returning an iterator instead of\n\
 a list.");
 
 static PyTypeObject izip_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.izip",		/* tp_name */
 	sizeof(izipobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2365,7 +2350,7 @@ repeat_dealloc(repeatobject *ro)
 {
 	PyObject_GC_UnTrack(ro);
 	Py_XDECREF(ro->element);
-	ro->ob_type->tp_free(ro);
+	Py_Type(ro)->tp_free(ro);
 }
 
 static int
@@ -2428,8 +2413,7 @@ for the specified number of times.  If not specified, returns the element\n\
 endlessly.");
 
 static PyTypeObject repeat_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.repeat",		/* tp_name */
 	sizeof(repeatobject),		/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2561,7 +2545,7 @@ izip_longest_dealloc(iziplongestobject *lz)
 	Py_XDECREF(lz->ittuple);
 	Py_XDECREF(lz->result);
 	Py_XDECREF(lz->fillvalue);
-	lz->ob_type->tp_free(lz);
+	Py_Type(lz)->tp_free(lz);
 }
 
 static int
@@ -2587,7 +2571,7 @@ izip_longest_next(iziplongestobject *lz)
 		return NULL;
         if (lz->numactive == 0)
                 return NULL;
-	if (result->ob_refcnt == 1) {
+	if (Py_Refcnt(result) == 1) {
 		Py_INCREF(result);
 		for (i=0 ; i < tuplesize ; i++) {
 			it = PyTuple_GET_ITEM(lz->ittuple, i);
@@ -2596,7 +2580,7 @@ izip_longest_next(iziplongestobject *lz)
                                 item = lz->fillvalue;
                         } else {
                                 assert(PyIter_Check(it));
-                                item = (*it->ob_type->tp_iternext)(it);
+                                item = (*Py_Type(it)->tp_iternext)(it);
                                 if (item == NULL) {
                                         lz->numactive -= 1;      
                                         if (lz->numactive == 0) {
@@ -2625,7 +2609,7 @@ izip_longest_next(iziplongestobject *lz)
                                 item = lz->fillvalue;
                         } else {
                                 assert(PyIter_Check(it));
-                                item = (*it->ob_type->tp_iternext)(it);
+                                item = (*Py_Type(it)->tp_iternext)(it);
                                 if (item == NULL) {
                                         lz->numactive -= 1;      
                                         if (lz->numactive == 0) {
@@ -2657,8 +2641,7 @@ defaults to None or can be specified by a keyword argument.\n\
 ");
 
 static PyTypeObject iziplongest_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"itertools.izip_longest",	/* tp_name */
 	sizeof(iziplongestobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -2757,7 +2740,7 @@ inititertools(void)
 		NULL
 	};
 
-	teedataobject_type.ob_type = &PyType_Type;
+	Py_Type(&teedataobject_type) = &PyType_Type;
 	m = Py_InitModule3("itertools", module_methods, module_doc);
 	if (m == NULL)
 		return;
diff --git a/Modules/linuxaudiodev.c b/Modules/linuxaudiodev.c
index b435d76..730ec0c 100644
--- a/Modules/linuxaudiodev.c
+++ b/Modules/linuxaudiodev.c
@@ -441,8 +441,7 @@ lad_getattr(lad_t *xp, char *name)
 }
 
 static PyTypeObject Ladtype = {
-    PyObject_HEAD_INIT(&PyType_Type)
-    0,				/*ob_size*/
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "linuxaudiodev.linux_audio_device", /*tp_name*/
     sizeof(lad_t),		/*tp_size*/
     0,				/*tp_itemsize*/
diff --git a/Modules/md5module.c b/Modules/md5module.c
index 5e4f116..f6e4299 100644
--- a/Modules/md5module.c
+++ b/Modules/md5module.c
@@ -221,8 +221,7 @@ hexdigest() -- return the current digest as a string of hexadecimal digits\n\
 copy() -- return a copy of the current md5 object");
 
 static PyTypeObject MD5type = {
-	PyObject_HEAD_INIT(NULL)
-	0,			  /*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"_md5.md5",		  /*tp_name*/
 	sizeof(md5object),	  /*tp_size*/
 	0,			  /*tp_itemsize*/
@@ -299,7 +298,7 @@ init_md5(void)
 {
 	PyObject *m, *d;
 
-        MD5type.ob_type = &PyType_Type;
+        Py_Type(&MD5type) = &PyType_Type;
         if (PyType_Ready(&MD5type) < 0)
             return;
 	m = Py_InitModule3("_md5", md5_functions, module_doc);
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 091ecd6..a92954b 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -782,8 +782,7 @@ static PyBufferProcs mmap_as_buffer = {
 };
 
 static PyTypeObject mmap_object_type = {
-	PyObject_HEAD_INIT(0) /* patched in module init */
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(0, 0) /* patched in module init */
 	"mmap.mmap",				/* tp_name */
 	sizeof(mmap_object),			/* tp_size */
 	0,					/* tp_itemsize */
@@ -1141,7 +1140,7 @@ PyMODINIT_FUNC
 	PyObject *dict, *module;
 
 	/* Patch the object type */
-	mmap_object_type.ob_type = &PyType_Type;
+	Py_Type(&mmap_object_type) = &PyType_Type;
 
 	module = Py_InitModule("mmap", mmap_functions);
 	if (module == NULL)
diff --git a/Modules/operator.c b/Modules/operator.c
index 0a7222a..b6c3d00 100644
--- a/Modules/operator.c
+++ b/Modules/operator.c
@@ -397,8 +397,7 @@ After, f=itemgetter(2), the call f(r) returns r[2].\n\
 After, g=itemgetter(2,5,3), the call g(r) returns (r[2], r[5], r[3])");
 
 static PyTypeObject itemgetter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"operator.itemgetter",		/* tp_name */
 	sizeof(itemgetterobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
@@ -535,8 +534,7 @@ After, f=attrgetter('name'), the call f(r) returns r.name.\n\
 After, g=attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).");
 
 static PyTypeObject attrgetter_type = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/* ob_size */
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"operator.attrgetter",		/* tp_name */
 	sizeof(attrgetterobject),	/* tp_basicsize */
 	0,				/* tp_itemsize */
diff --git a/Modules/ossaudiodev.c b/Modules/ossaudiodev.c
index eb59c4d..ebf101a 100644
--- a/Modules/ossaudiodev.c
+++ b/Modules/ossaudiodev.c
@@ -841,8 +841,7 @@ oss_mixer_getattr(oss_mixer_t *self, char *name)
 }
 
 static PyTypeObject OSSAudioType = {
-    PyObject_HEAD_INIT(&PyType_Type)
-    0,                          /*ob_size*/
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "ossaudiodev.oss_audio_device", /*tp_name*/
     sizeof(oss_audio_t),        /*tp_size*/
     0,                          /*tp_itemsize*/
@@ -856,8 +855,7 @@ static PyTypeObject OSSAudioType = {
 };
 
 static PyTypeObject OSSMixerType = {
-    PyObject_HEAD_INIT(&PyType_Type)
-    0,                              /*ob_size*/
+    PyVarObject_HEAD_INIT(&PyType_Type, 0)
     "ossaudiodev.oss_mixer_device", /*tp_name*/
     sizeof(oss_mixer_t),            /*tp_size*/
     0,                              /*tp_itemsize*/
diff --git a/Modules/parsermodule.c b/Modules/parsermodule.c
index 23364fe..f502bb5 100644
--- a/Modules/parsermodule.c
+++ b/Modules/parsermodule.c
@@ -166,8 +166,7 @@ static PyObject *parser_getattr(PyObject *self, char *name);
 
 static
 PyTypeObject PyST_Type = {
-    PyObject_HEAD_INIT(NULL)
-    0,
+    PyVarObject_HEAD_INIT(NULL, 0)
     "parser.st",                        /* tp_name              */
     (int) sizeof(PyST_Object),          /* tp_basicsize         */
     0,                                  /* tp_itemsize          */
@@ -694,7 +693,7 @@ build_node_children(PyObject *tuple, node *root, int *line_num)
                 PyErr_Format(parser_error,
                              "second item in terminal node must be a string,"
                              " found %s",
-                             temp->ob_type->tp_name);
+                             Py_Type(temp)->tp_name);
                 Py_DECREF(temp);
                 return 0;
             }
@@ -707,7 +706,7 @@ build_node_children(PyObject *tuple, node *root, int *line_num)
                         PyErr_Format(parser_error,
                                      "third item in terminal node must be an"
                                      " integer, found %s",
-				     temp->ob_type->tp_name);
+				     Py_Type(temp)->tp_name);
                         Py_DECREF(o);
                         Py_DECREF(temp);
                         return 0;
@@ -3233,7 +3232,7 @@ initparser(void)
 {
     PyObject *module, *copyreg;
 
-    PyST_Type.ob_type = &PyType_Type;
+    Py_Type(&PyST_Type) = &PyType_Type;
     module = Py_InitModule("parser", parser_functions);
     if (module == NULL)
     	return;
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 2b62983..8a78d8c 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2593,7 +2593,7 @@ extract_time(PyObject *t, long* sec, long* usec)
 	long intval;
 	if (PyFloat_Check(t)) {
 		double tval = PyFloat_AsDouble(t);
-		PyObject *intobj = t->ob_type->tp_as_number->nb_int(t);
+		PyObject *intobj = Py_Type(t)->tp_as_number->nb_int(t);
 		if (!intobj)
 			return -1;
 		intval = PyInt_AsLong(intobj);
diff --git a/Modules/pyexpat.c b/Modules/pyexpat.c
index 67f7007..301fbf5 100644
--- a/Modules/pyexpat.c
+++ b/Modules/pyexpat.c
@@ -974,7 +974,7 @@ readinst(char *buf, int buf_size, PyObject *meth)
     if (!PyString_Check(str)) {
         PyErr_Format(PyExc_TypeError,
                      "read() did not return a string object (type=%.400s)",
-                     str->ob_type->tp_name);
+                     Py_Type(str)->tp_name);
         goto finally;
     }
     len = PyString_GET_SIZE(str);
@@ -1687,8 +1687,7 @@ xmlparse_clear(xmlparseobject *op)
 PyDoc_STRVAR(Xmlparsetype__doc__, "XML parser");
 
 static PyTypeObject Xmlparsetype = {
-	PyObject_HEAD_INIT(NULL)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"pyexpat.xmlparser",		/*tp_name*/
 	sizeof(xmlparseobject) + PyGC_HEAD_SIZE,/*tp_basicsize*/
 	0,				/*tp_itemsize*/
@@ -1860,7 +1859,7 @@ MODULE_INITFUNC(void)
     if (modelmod_name == NULL)
         return;
 
-    Xmlparsetype.ob_type = &PyType_Type;
+    Py_Type(&Xmlparsetype) = &PyType_Type;
 
     /* Create the module and add the functions */
     m = Py_InitModule3(MODULE_NAME, pyexpat_methods,
diff --git a/Modules/selectmodule.c b/Modules/selectmodule.c
index 9eaae84..995f8e7 100644
--- a/Modules/selectmodule.c
+++ b/Modules/selectmodule.c
@@ -587,8 +587,7 @@ poll_getattr(pollObject *self, char *name)
 static PyTypeObject poll_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"select.poll",		/*tp_name*/
 	sizeof(pollObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -706,7 +705,7 @@ initselect(void)
 #else
 	{
 #endif
-		poll_Type.ob_type = &PyType_Type;
+		Py_Type(&poll_Type) = &PyType_Type;
 		PyModule_AddIntConstant(m, "POLLIN", POLLIN);
 		PyModule_AddIntConstant(m, "POLLPRI", POLLPRI);
 		PyModule_AddIntConstant(m, "POLLOUT", POLLOUT);
diff --git a/Modules/sha256module.c b/Modules/sha256module.c
index 0effb07..24fd47a 100644
--- a/Modules/sha256module.c
+++ b/Modules/sha256module.c
@@ -409,7 +409,7 @@ SHA256_copy(SHAobject *self, PyObject *unused)
 {
     SHAobject *newobj;
 
-    if (((PyObject*)self)->ob_type == &SHA256type) {
+    if (Py_Type(self) == &SHA256type) {
         if ( (newobj = newSHA256object())==NULL)
             return NULL;
     } else {
@@ -536,8 +536,7 @@ static PyMemberDef SHA_members[] = {
 };
 
 static PyTypeObject SHA224type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha256.sha224",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -571,8 +570,7 @@ static PyTypeObject SHA224type = {
 };
 
 static PyTypeObject SHA256type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha256.sha256",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -689,10 +687,10 @@ init_sha256(void)
 {
     PyObject *m;
 
-    SHA224type.ob_type = &PyType_Type;
+    Py_Type(&SHA224type) = &PyType_Type;
     if (PyType_Ready(&SHA224type) < 0)
         return;
-    SHA256type.ob_type = &PyType_Type;
+    Py_Type(&SHA256type) = &PyType_Type;
     if (PyType_Ready(&SHA256type) < 0)
         return;
     m = Py_InitModule("_sha256", SHA_functions);
diff --git a/Modules/sha512module.c b/Modules/sha512module.c
index 9f47b61..b62cfd9 100644
--- a/Modules/sha512module.c
+++ b/Modules/sha512module.c
@@ -602,8 +602,7 @@ static PyMemberDef SHA_members[] = {
 };
 
 static PyTypeObject SHA384type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha512.sha384",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -637,8 +636,7 @@ static PyTypeObject SHA384type = {
 };
 
 static PyTypeObject SHA512type = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha512.sha512",	/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -755,10 +753,10 @@ init_sha512(void)
 {
     PyObject *m;
 
-    SHA384type.ob_type = &PyType_Type;
+    Py_Type(&SHA384type) = &PyType_Type;
     if (PyType_Ready(&SHA384type) < 0)
         return;
-    SHA512type.ob_type = &PyType_Type;
+    Py_Type(&SHA512type) = &PyType_Type;
     if (PyType_Ready(&SHA512type) < 0)
         return;
     m = Py_InitModule("_sha512", SHA_functions);
diff --git a/Modules/shamodule.c b/Modules/shamodule.c
index 8d68d16..e268352 100644
--- a/Modules/shamodule.c
+++ b/Modules/shamodule.c
@@ -489,8 +489,7 @@ static PyGetSetDef SHA_getseters[] = {
 };
 
 static PyTypeObject SHAtype = {
-    PyObject_HEAD_INIT(NULL)
-    0,			/*ob_size*/
+    PyVarObject_HEAD_INIT(NULL, 0)
     "_sha.sha",		/*tp_name*/
     sizeof(SHAobject),	/*tp_size*/
     0,			/*tp_itemsize*/
@@ -577,7 +576,7 @@ init_sha(void)
 {
     PyObject *m;
 
-    SHAtype.ob_type = &PyType_Type;
+    Py_Type(&SHAtype) = &PyType_Type;
     if (PyType_Ready(&SHAtype) < 0)
         return;
     m = Py_InitModule("_sha", SHA_functions);
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 97ca816..d319ca3 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1245,7 +1245,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_NETLINK address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "II:getsockaddrarg", &pid, &groups))
@@ -1268,7 +1268,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_INET address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "eti:getsockaddrarg",
@@ -1298,7 +1298,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_INET6 address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "eti|ii",
@@ -1420,7 +1420,7 @@ getsockaddrarg(PySocketSockObject *s, PyObject *args,
 				PyExc_TypeError,
 				"getsockaddrarg: "
 				"AF_PACKET address must be tuple, not %.500s",
-				args->ob_type->tp_name);
+				Py_Type(args)->tp_name);
 			return 0;
 		}
 		if (!PyArg_ParseTuple(args, "si|iis#", &interfaceName,
@@ -2843,7 +2843,7 @@ sock_dealloc(PySocketSockObject *s)
 {
 	if (s->sock_fd != -1)
 		(void) SOCKETCLOSE(s->sock_fd);
-	s->ob_type->tp_free((PyObject *)s);
+	Py_Type(s)->tp_free((PyObject *)s);
 }
 
 
@@ -2928,8 +2928,7 @@ sock_initobj(PyObject *self, PyObject *args, PyObject *kwds)
 /* Type object for socket objects. */
 
 static PyTypeObject sock_type = {
-	PyObject_HEAD_INIT(0)	/* Must fill in type value later */
-	0,					/* ob_size */
+	PyVarObject_HEAD_INIT(0, 0)	/* Must fill in type value later */
 	"_socket.socket",			/* tp_name */
 	sizeof(PySocketSockObject),		/* tp_basicsize */
 	0,					/* tp_itemsize */
@@ -3555,7 +3554,7 @@ socket_ntohl(PyObject *self, PyObject *arg)
 	else
 		return PyErr_Format(PyExc_TypeError,
 				    "expected int/long, %s found",
-				    arg->ob_type->tp_name);
+				    Py_Type(arg)->tp_name);
 	if (x == (unsigned long) -1 && PyErr_Occurred())
 		return NULL;
 	return PyLong_FromUnsignedLong(ntohl(x));
@@ -3624,7 +3623,7 @@ socket_htonl(PyObject *self, PyObject *arg)
 	else
 		return PyErr_Format(PyExc_TypeError,
 				    "expected int/long, %s found",
-				    arg->ob_type->tp_name);
+				    Py_Type(arg)->tp_name);
 	return PyLong_FromUnsignedLong(htonl((unsigned long)x));
 }
 
@@ -4274,7 +4273,7 @@ init_socket(void)
 	if (!os_init())
 		return;
 
-	sock_type.ob_type = &PyType_Type;
+	Py_Type(&sock_type) = &PyType_Type;
 	m = Py_InitModule3(PySocket_MODULE_NAME,
 			   socket_methods,
 			   socket_doc);
diff --git a/Modules/sunaudiodev.c b/Modules/sunaudiodev.c
index 802184d..4288403 100644
--- a/Modules/sunaudiodev.c
+++ b/Modules/sunaudiodev.c
@@ -42,8 +42,8 @@ static sadstatusobject *sads_alloc(void);	/* Forward */
 
 static PyObject *SunAudioError;
 
-#define is_sadobject(v)		((v)->ob_type == &Sadtype)
-#define is_sadstatusobject(v)	((v)->ob_type == &Sadstatustype)
+#define is_sadobject(v)		(Py_Type(v) == &Sadtype)
+#define is_sadstatusobject(v)	(Py_Type(v) == &Sadstatustype)
 
 
 static sadobject *
@@ -409,8 +409,7 @@ sads_setattr(sadstatusobject *xp, char *name, PyObject *v)
 
 
 static PyTypeObject Sadtype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"sunaudiodev.sun_audio_device",	/*tp_name*/
 	sizeof(sadobject),		/*tp_size*/
 	0,				/*tp_itemsize*/
@@ -424,8 +423,7 @@ static PyTypeObject Sadtype = {
 };
 
 static PyTypeObject Sadstatustype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"sunaudiodev.sun_audio_device_status", /*tp_name*/
 	sizeof(sadstatusobject),	/*tp_size*/
 	0,				/*tp_itemsize*/
diff --git a/Modules/threadmodule.c b/Modules/threadmodule.c
index 036619a..9e40771 100644
--- a/Modules/threadmodule.c
+++ b/Modules/threadmodule.c
@@ -126,8 +126,7 @@ lock_getattr(lockobject *self, char *name)
 }
 
 static PyTypeObject Locktype = {
-	PyObject_HEAD_INIT(&PyType_Type)
-	0,				/*ob_size*/
+	PyVarObject_HEAD_INIT(&PyType_Type, 0)
 	"thread.lock",			/*tp_name*/
 	sizeof(lockobject),		/*tp_size*/
 	0,				/*tp_itemsize*/
@@ -251,7 +250,7 @@ local_dealloc(localobject *self)
 	}
 
 	local_clear(self);
-	self->ob_type->tp_free((PyObject*)self);
+	Py_Type(self)->tp_free((PyObject*)self);
 }
 
 static PyObject *
@@ -283,8 +282,8 @@ _ldict(localobject *self)
 		Py_INCREF(ldict);
 		self->dict = ldict; /* still borrowed */
 
-		if (self->ob_type->tp_init != PyBaseObject_Type.tp_init &&
-		    self->ob_type->tp_init((PyObject*)self, 
+		if (Py_Type(self)->tp_init != PyBaseObject_Type.tp_init &&
+		    Py_Type(self)->tp_init((PyObject*)self, 
 					   self->args, self->kw) < 0) {
 			/* we need to get rid of ldict from thread so
 			   we create a new one the next time we do an attr
@@ -336,8 +335,7 @@ static PyGetSetDef local_getset[] = {
 static PyObject *local_getattro(localobject *, PyObject *);
 
 static PyTypeObject localtype = {
-	PyObject_HEAD_INIT(NULL)
-	/* ob_size           */ 0,
+	PyVarObject_HEAD_INIT(NULL, 0)
 	/* tp_name           */ "thread._local",
 	/* tp_basicsize      */ sizeof(localobject),
 	/* tp_itemsize       */ 0,
@@ -388,7 +386,7 @@ local_getattro(localobject *self, PyObject *name)
 	if (ldict == NULL) 
 		return NULL;
 
-	if (self->ob_type != &localtype)
+	if (Py_Type(self) != &localtype)
 		/* use generic lookup for subtypes */
 		return PyObject_GenericGetAttr((PyObject *)self, name);
 
diff --git a/Modules/unicodedata.c b/Modules/unicodedata.c
index a30d30c..fac9adc 100644
--- a/Modules/unicodedata.c
+++ b/Modules/unicodedata.c
@@ -1134,8 +1134,7 @@ static PyMethodDef unicodedata_functions[] = {
 static PyTypeObject UCD_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"unicodedata.UCD",		/*tp_name*/
 	sizeof(PreviousDBVersion),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -1193,7 +1192,7 @@ initunicodedata(void)
 {
     PyObject *m, *v;
 
-    UCD_Type.ob_type = &PyType_Type;
+    Py_Type(&UCD_Type) = &PyType_Type;
 
     m = Py_InitModule3(
         "unicodedata", unicodedata_functions, unicodedata_docstring);
diff --git a/Modules/xxmodule.c b/Modules/xxmodule.c
index ea66eef..0923f81 100644
--- a/Modules/xxmodule.c
+++ b/Modules/xxmodule.c
@@ -25,7 +25,7 @@ typedef struct {
 
 static PyTypeObject Xxo_Type;
 
-#define XxoObject_Check(v)	((v)->ob_type == &Xxo_Type)
+#define XxoObject_Check(v)	(Py_Type(v) == &Xxo_Type)
 
 static XxoObject *
 newXxoObject(PyObject *arg)
@@ -97,8 +97,7 @@ Xxo_setattr(XxoObject *self, char *name, PyObject *v)
 static PyTypeObject Xxo_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"xxmodule.Xxo",		/*tp_name*/
 	sizeof(XxoObject),	/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -216,8 +215,7 @@ xx_roj(PyObject *self, PyObject *args)
 static PyTypeObject Str_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"xxmodule.Str",		/*tp_name*/
 	0,			/*tp_basicsize*/
 	0,			/*tp_itemsize*/
@@ -272,8 +270,7 @@ null_richcompare(PyObject *self, PyObject *other, int op)
 static PyTypeObject Null_Type = {
 	/* The ob_type field must be initialized in the module init function
 	 * to be portable to Windows without using C++. */
-	PyObject_HEAD_INIT(NULL)
-	0,			/*ob_size*/
+	PyVarObject_HEAD_INIT(NULL, 0)
 	"xxmodule.Null",	/*tp_name*/
 	0,			/*tp_basicsize*/
 	0,			/*tp_itemsize*/
diff --git a/Modules/xxsubtype.c b/Modules/xxsubtype.c
index 88ce6c5..0cf0b81 100644
--- a/Modules/xxsubtype.c
+++ b/Modules/xxsubtype.c
@@ -101,8 +101,7 @@ static PyGetSetDef spamlist_getsets[] = {
 };
 
 static PyTypeObject spamlist_type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"xxsubtype.spamlist",
 	sizeof(spamlistobject),
 	0,
@@ -193,8 +192,7 @@ static PyMemberDef spamdict_members[] = {
 };
 
 static PyTypeObject spamdict_type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"xxsubtype.spamdict",
 	sizeof(spamdictobject),
 	0,
diff --git a/Modules/zipimport.c b/Modules/zipimport.c
index 69b2881..ae6af46 100644
--- a/Modules/zipimport.c
+++ b/Modules/zipimport.c
@@ -181,7 +181,7 @@ zipimporter_dealloc(ZipImporter *self)
 	Py_XDECREF(self->archive);
 	Py_XDECREF(self->prefix);
 	Py_XDECREF(self->files);
-	self->ob_type->tp_free((PyObject *)self);
+	Py_Type(self)->tp_free((PyObject *)self);
 }
 
 static PyObject *
@@ -561,8 +561,7 @@ a valid Zip archive.");
 #define DEFERRED_ADDRESS(ADDR) 0
 
 static PyTypeObject ZipImporter_Type = {
-	PyObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type))
-	0,
+	PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
 	"zipimport.zipimporter",
 	sizeof(ZipImporter),
 	0,					/* tp_itemsize */
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index da31e8b..43f435a 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -935,8 +935,7 @@ static PyMethodDef zlib_methods[] =
 };
 
 static PyTypeObject Comptype = {
-    PyObject_HEAD_INIT(0)
-    0,
+    PyVarObject_HEAD_INIT(0, 0)
     "zlib.Compress",
     sizeof(compobject),
     0,
@@ -952,8 +951,7 @@ static PyTypeObject Comptype = {
 };
 
 static PyTypeObject Decomptype = {
-    PyObject_HEAD_INIT(0)
-    0,
+    PyVarObject_HEAD_INIT(0, 0)
     "zlib.Decompress",
     sizeof(compobject),
     0,
@@ -987,8 +985,8 @@ PyMODINIT_FUNC
 PyInit_zlib(void)
 {
     PyObject *m, *ver;
-    Comptype.ob_type = &PyType_Type;
-    Decomptype.ob_type = &PyType_Type;
+    Py_Type(&Comptype) = &PyType_Type;
+    Py_Type(&Decomptype) = &PyType_Type;
     m = Py_InitModule4("zlib", zlib_methods,
 		       zlib_module_documentation,
 		       (PyObject*)NULL,PYTHON_API_VERSION);