Tuple arg for "classinfo" in isinstance: what does it mean?

[Erik Max Francis]

Parzival Herzog wrote:

> So, from this, I know I am allowed to supply a tuple, but I have no
> idea at
> all what such
> a tuple argument means to  the result of isinstance.
> 
> Can anyone supply the semantics? If you can, would you please tell me
> the
> source reference for your information?

Seems pretty clear that the meaning is that if a tuple (or a tuple of
tuples, etc.) is passed in, isinstance will return true if any of the
non-tuple objects match:

>>> isinstance(2, str)
0
>>> isinstance(2, int)
1
>>> isinstance(2, (int, str))
1
>>> isinstance(2, (int, (str,)))
1

In other words, passing tuples to isinstance is functionally equivalent
to multiple calls to isinstance with each element, chained together by
or.

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