2.7 compatibility for OrderedDictionary

dict doesn't have keys() in older versions

Author: ke4roh

recipes/Python/107747_Ordered_Dictionary/recipe-107747.py

@@ -45,8 +45,9 @@ def setdefault(self, key, failobj = None):
 
     def update(self, dict):
         UserDict.update(self, dict)
-        for key in dict.keys():
-            if key not in self._keys: self._keys.append(key)
+        for key in dict.__iter__():
+            if key not in self._keys: 
+                self._keys.append(key)
 
     def values(self):
         return map(self.get, self._keys)