From: Guido van Rossum <guido@python.org>
Date: Fri, 10 Jul 1998 18:03:50 +0000 (+0000)
Subject: Add special case to PySequence_List() so that list() of a list is
X-Git-Tag: v1.5.2a1~311
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5dba9e8aef544c0f10bda0ecbd965ac08d019f27;p=python

Add special case to PySequence_List() so that list() of a list is
faster (using PyList_GetSlice()).  Also added a test for a NULL
argument, as with PySequence_Tuple().  (Hmm...  Better names for these
two would be PyList_FromSequence() and PyTuple_FromSequence().  Oh well.)
---

diff --git a/Objects/abstract.c b/Objects/abstract.c
index a94a1368c9..cfa4cc839c 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1055,6 +1055,12 @@ PySequence_List(v)
 {
 	PySequenceMethods *m;
 
+	if (v == NULL)
+		return null_error();
+
+	if (PyList_Check(v))
+		return PyList_GetSlice(v, 0, PyList_GET_SIZE(v));
+
 	m = v->ob_type->tp_as_sequence;
 	if (m && m->sq_item) {
 		int i;