[issue4963] mimetypes.guess_extension result changes after mimetypes.init()

[R. David Murray]

R. David Murray added the comment:

I'd forgotten about this issue.  I wonder if the dictionary randomization makes the problem worse.

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components: +email
nosy: +barry
versions: +Python 3.2, Python 3.3, Python 3.4

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<http://bugs.python.org/issue4963>
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