Issue #11875: Alter the previous fix to work better with subclasses

rhettinger · rhettinger · commit c98556e72e38 · 2011-04-19T16:53:07.000-07:00
diff --git a/Lib/collections.py b/Lib/collections.py
@@ -116,7 +116,7 @@ def __reduce__(self):
         'Return state information for pickling'
         items = [[k, self[k]] for k in self]
         inst_dict = vars(self).copy()
-        for k in vars(self.__class__()):
+        for k in vars(OrderedDict()):
             inst_dict.pop(k, None)
         if inst_dict:
             return (self.__class__, (items,), inst_dict)
