Fixed #2791 -- Added __contains__ method (for "a in dict" checks) to MergeDict.

Thanks, Ned Batchelder.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@3808 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/datastructures.py

@@ -14,6 +14,9 @@ class MergeDict(object):
                 pass
         raise KeyError
 
+    def __contains__(self, key):
+        return self.has_key(key)
+
     def get(self, key, default):
         try:
             return self[key]