From 0b795e5b369ff74579464495b448c6f2d2d7c869 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Sat, 23 Apr 2011 15:41:38 -0700
Subject: [PATCH] Minor code simplification.

---
 Lib/collections.py | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/Lib/collections.py b/Lib/collections.py
index f2ae8ea5c1d..321daa394ec 100644
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -45,10 +45,8 @@ class OrderedDict(dict):
         try:
             self.__root
         except AttributeError:
-            self.__root = root = [None, None, None]     # sentinel node
-            PREV = 0
-            NEXT = 1
-            root[PREV] = root[NEXT] = root
+            self.__root = root = []                     # sentinel node
+            root[:] = [root, root, None]
             self.__map = {}
         self.__update(*args, **kwds)