From 1efa80770382d4995c2d6e67972d8a99021ec81f Mon Sep 17 00:00:00 2001
From: Justin Bronn <jbronn@gmail.com>
Date: Sat, 11 Sep 2010 02:28:16 +0000
Subject: [PATCH] Fixed #12632 -- Improved performance of `SortedDict`. 
 Thanks, Alex Gaynor.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13742 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/utils/datastructures.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/django/utils/datastructures.py b/django/utils/datastructures.py
index 4656f60f2b..30ce28d38d 100644
--- a/django/utils/datastructures.py
+++ b/django/utils/datastructures.py
@@ -120,9 +120,11 @@ class SortedDict(dict):
             self.keyOrder = data.keys()
         else:
             self.keyOrder = []
+            seen = set()
             for key, value in data:
-                if key not in self.keyOrder:
+                if key not in seen:
                     self.keyOrder.append(key)
+                    seen.add(key)
 
     def __deepcopy__(self, memo):
         return self.__class__([(key, deepcopy(value, memo))