[docs] [issue16331] Add a version switcher to python docs site

[Éric Araujo]

Éric Araujo added the comment:

Typically we close the newer issue as duplicate of the existing one, unless the new has much more discussion or patches.  I would close this one.

About renamed modules: there’s a mapping in lib2to3 that contains the info.

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<http://bugs.python.org/issue16331>
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