[docs] [issue25432] isinstance documentation: explain behavior when type is a tuple

[Terry J. Reedy]

Terry J. Reedy added the comment:

Perhaps add after third sentence (ending with "not accepted)."), "If classinfo is a tuple, isinstance(x, classinfo) is the same as any(isinstance(x, C) for C in flatten(classinfo))".

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nosy: +terry.reedy
stage:  -> needs patch
title: isinstance documentation doesn't explain what happens when type is tuple -> isinstance documentation: explain behavior when type is a tuple
type:  -> enhancement
versions: +Python 3.4, Python 3.5

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<http://bugs.python.org/issue25432>
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