From ea072660146e8af25b1d492d868458db66791378 Mon Sep 17 00:00:00 2001
From: Yoshinori Okuji <yo@nexedi.com>
Date: Thu, 9 Jun 2005 17:44:19 +0000
Subject: [PATCH] Small optimization of cartesianProduct.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@3230 20353a03-c40f-0410-a6d1-a30d3c3de9de
---
 product/ERP5Type/Utils.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/product/ERP5Type/Utils.py b/product/ERP5Type/Utils.py
index 7445cd4601..18985307b7 100755
--- a/product/ERP5Type/Utils.py
+++ b/product/ERP5Type/Utils.py
@@ -96,12 +96,13 @@ def cartesianProduct(list_of_list):
   if len(list_of_list) == 0:
     return [[]]
   result = []
+  append = result.append
   head = list_of_list[0]
   tail = list_of_list[1:]
   product = cartesianProduct(tail)
   for v in head:
     for p in product:
-      result += [[v] + p]
+      append([v] + p)
   return result
 
 # Some list operations
-- 
2.30.9