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| author | Raymond Hettinger <python@rcn.com> | 2004-02-08 10:49:42 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2004-02-08 10:49:42 (GMT) |
| commit | 06353f76beab69a538d3a55ca9b6df7e9754b999 (patch) | |
| tree | 3d0caeac4f7b271d32c35333a6b4f47baedbfa46 | |
| parent | 8a1a5945908c7a0b2b487a98431ff46ab934014a (diff) | |
| download | cpython-06353f76beab69a538d3a55ca9b6df7e9754b999.zip cpython-06353f76beab69a538d3a55ca9b6df7e9754b999.tar.gz cpython-06353f76beab69a538d3a55ca9b6df7e9754b999.tar.bz2 | |
Let reversed() work with itself.
| -rw-r--r-- | Include/listobject.h | 1 | ||||
| -rw-r--r-- | Lib/test/test_enumerate.py | 4 | ||||
| -rw-r--r-- | Objects/enumobject.c | 13 |
3 files changed, 17 insertions, 1 deletions
diff --git a/Include/listobject.h b/Include/listobject.h index 14ed72e..6221b80 100644 --- a/Include/listobject.h +++ b/Include/listobject.h @@ -22,6 +22,7 @@ extern "C" { typedef struct { PyObject_VAR_HEAD PyObject **ob_item; + int allocated; } PyListObject; PyAPI_DATA(PyTypeObject) PyList_Type; diff --git a/Lib/test/test_enumerate.py b/Lib/test/test_enumerate.py index 636f883..ab1a60d 100644 --- a/Lib/test/test_enumerate.py +++ b/Lib/test/test_enumerate.py @@ -141,6 +141,10 @@ class TestReversed(unittest.TestCase): x = xrange(1) self.assertEqual(type(reversed(x)), type(iter(x))) + def test_double_reverse(self): + s = 'hello' + self.assertEqual(list(reversed(reversed(s))), list(s)) + def test_main(verbose=None): testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig, TestReversed) diff --git a/Objects/enumobject.c b/Objects/enumobject.c index 7ed58da..3aac680 100644 --- a/Objects/enumobject.c +++ b/Objects/enumobject.c @@ -230,11 +230,22 @@ reversed_next(reversedobject *ro) return item; } +static PyObject * +reversed_reverse(reversedobject *ro, PyObject *unused) +{ + return PyObject_GetIter(ro->seq); +} + PyDoc_STRVAR(reversed_doc, "reverse(sequence) -> reverse iterator over values of the sequence\n" "\n" "Return a reverse iterator"); +static PyMethodDef reversed_methods[] = { + {"__reversed__", (PyCFunction)reversed_reverse, + METH_NOARGS, reversed_doc}, +}; + PyTypeObject PyReversed_Type = { PyObject_HEAD_INIT(&PyType_Type) 0, /* ob_size */ @@ -266,7 +277,7 @@ PyTypeObject PyReversed_Type = { 0, /* tp_weaklistoffset */ PyObject_SelfIter, /* tp_iter */ (iternextfunc)reversed_next, /* tp_iternext */ - 0, /* tp_methods */ + reversed_methods, /* tp_methods */ 0, /* tp_members */ 0, /* tp_getset */ 0, /* tp_base */ |