[issue2876] Write UserDict fixer for 2to3

[Brett Cannon]

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

I don't know if 2to3 can handle the class renames. Up to this point we 
have only been handling module renames.

Collin, how doable is this?

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assignee: brett.cannon -> collinwinter
nosy: +collinwinter

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