[issue7826] support caching for 2to3

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

I'm apprehensive about accepting this patch for several reasons. First of all, it has no tests. Secondly, and more importantly, I dislike the hacks that it adds. I would prefer 2to3 to grow a more general plugin API, which people could use to add new fixer etc as well and customizes behavior like this.

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keywords:  -needs review
priority: normal -> low

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<http://bugs.python.org/issue7826>
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