Add pop() to UserDict.
diff --git a/Lib/UserDict.py b/Lib/UserDict.py
index b78860f..91af83c 100644
--- a/Lib/UserDict.py
+++ b/Lib/UserDict.py
@@ -50,6 +50,8 @@
         if not self.has_key(key):
             self[key] = failobj
         return self[key]
+    def pop(self, key):
+        return self.data.pop(key)
     def popitem(self):
         return self.data.popitem()
     def __contains__(self, key):