From a2777d3a55ca75f199ab4cedd8653104f2bcf40e Mon Sep 17 00:00:00 2001
From: Alex Martelli <aleaxit@gmail.com>
Date: Sat, 25 Oct 2003 12:49:56 +0000
Subject: [PATCH] Changed builtin_sum to use PyNumber_InPlaceAdd (same
 semantics, but fixes a performance bug in sum(manylists)), same as in 2.3
 maintenance branch.

---
 Python/bltinmodule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 0309f1de559..718b603b7d2 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1840,7 +1840,7 @@ builtin_sum(PyObject *self, PyObject *args)
 			}
 			break;
 		}
-		temp = PyNumber_Add(result, item);
+		temp = PyNumber_InPlaceAdd(result, item);
 		Py_DECREF(result);
 		Py_DECREF(item);
 		result = temp;