From af1b4c95f9114d13c04052c4081b2272b6b1a6ab Mon Sep 17 00:00:00 2001
From: Alex Martelli <aleaxit@gmail.com>
Date: Sat, 25 Oct 2003 12:47:09 +0000
Subject: changed builtin_sum to use PyNumber_InPlaceAdd -- unchanged semantics
 but fixes performance bug with sum(lotsoflists, []).

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

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index e10d16b..22d728e 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;
-- 
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