[issue6626] show Python mimetypes module some love

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Thanks for working on cleaning up that module.  I have to agree with Nick though (see also minor comments on Rietveld): code in the stdlib just can’t move as freely as outside of it.

I’m updating the version to 3.3, given that this patch adds new features and refactors things (stable branches only get bug fixes).

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versions: +Python 3.3 -Python 2.7, Python 3.2

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