[issue2876] Write UserDict fixer for 2to3

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

The patch looks very good over all. However, I'm not completely sure
that 2to3 needs to give a warning on UserDict.UserDict instances.
Wouldn't it be better to handle that with a py3k warning in UserDict?

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<http://bugs.python.org/issue2876>
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