[issue16331] Add a version switcher to python docs site

[Yury Selivanov]

Yury Selivanov added the comment:

Eric, Ezio,

This one has a patch attached with a relevant discussion & review, so I'd close #8040.

But if you guys decide to close this one and switch to #8040 - i'm fine.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16331>
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