[issue2876] Write UserDict fixer for 2to3

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

You know what, Nick, go for the fixer. UserDict.UserDict will need a
deprecation warning, but otherwise a fixer for IterableUserDict and
DictMixin is fine.

And I can handle the deprecation if you want.

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assignee: collinwinter -> 

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2876>
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