[docs] [issue21434] python -3 documentation is outdated

[Éric Araujo]

Éric Araujo added the comment:

Aside: callable was added back in 3.2; warnings for that are now obsolete, and people often replaced it with bogus alternatives (like using hasattr on the object instead of its type).

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nosy: +eric.araujo

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<http://bugs.python.org/issue21434>
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