[issue2876] Write UserDict fixer for 2to3

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Converting DictMixin to collections.MutableMapping is not necessarily a complete solution.  MutableMapping does not provide all the methods that DictMixin does.  See for example the problems encountered in issue 7975.

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nosy: +r.david.murray

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