From 51f3f1b7dce6d054891faf9959fc493e66e9f684 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Wed, 22 Jan 2003 01:39:06 +0000
Subject: [PATCH] SF patch #667730: More DictMixin

Sebastien Keim pointed out that iterkeys and __contains__ require
their own definitions so their behavior will update when the
underlying method is subclassed.
---
 Lib/UserDict.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/UserDict.py b/Lib/UserDict.py
index 34ceb3a09b..f9ad47109f 100644
--- a/Lib/UserDict.py
+++ b/Lib/UserDict.py
@@ -90,13 +90,15 @@ class DictMixin:
         except KeyError:
             return False
         return True
-    __contains__ = has_key
+    def __contains__(self, key):
+        return self.has_key(key)
 
     # third level takes advantage of second level definitions
     def iteritems(self):
         for k in self:
             yield (k, self[k])
-    iterkeys = __iter__
+    def iterkeys(self):
+        return self.__iter__()
 
     # fourth level uses definitions from lower levels
     def itervalues(self):
-- 
2.40.0