[issue4909] incorrect renaming in imports

[Benjamin Peterson]

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

Tricky. I only solution I can think of is replacing cStringIO with
_stringio or just refusing to replace StringIO usage once cStringIO has
been seen. The latter seems like the best solutions.

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nosy: +benjamin.peterson

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<http://bugs.python.org/issue4909>
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