Raymond Hettinger <[EMAIL PROTECTED]> added the comment:

UserDict.UserDict is gone.
UserDict.IterableUserDict class is now collections.UserDict.
UserDict.Mixin is now collections.MutableMapping.

The new classes comform to the new dict API, so they fixer needs to 
also make same method adaptatations as for dicts (i.e. d.keys() --> list
(d.keys() and d.has_key --> d.__contains__).

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Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue2876>
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