commit 1021c44b413ebe264a6187322447ac296a0a18a7
author Raymond Hettinger <python@rcn.com> Fri Nov 07 15:38:09 2003 +0000
committer Raymond Hettinger <python@rcn.com> Fri Nov 07 15:38:09 2003 +0000
tree 0dec84fec0f7236cc6dc05cf13e7b3df6eaa23af
parent ff1f1949820126cce5c17f15c37843ccfd100564

Optimize reversed(list) using a custom iterator.

Objects/enumobject.c

diff --git a/Objects/enumobject.c b/Objects/enumobject.c
index 998e381..8b2e6e1 100644
--- a/Objects/enumobject.c
+++ b/Objects/enumobject.c
@@ -174,8 +174,8 @@
 	if (!PyArg_UnpackTuple(args, "reversed", 1, 1, &seq))
 		return NULL;
 
-	/* Special case optimization for xrange */
-	if (PyRange_Check(seq))
+	/* Special case optimization for xrange and lists */
+	if (PyRange_Check(seq) || PyList_Check(seq))
 		return PyObject_CallMethod(seq, "__reversed__", NULL);
 
 	if (!PySequence_Check(seq)) {