[Python-ideas] Allow isinstance second argument to be a set of types

[Michael Foord]

Hello all,

Occasionally I build up tuples of types for passing as the second argument
to isinstance. I've noticed on occasions having duplicates, for example the
following code is Python 2 & 3 compatible but results in a duplicate on one
of them:

FunctionTypes = (
    # python function
    type(create_autospec),
    # instance method
    type(ANY.__eq__),
    # unbound method
    type(_ANY.__eq__),
)

It would feel cleaner to me if I could make FunctionTypes a set and use that
as the second argument to isinstance. :-)

Michael

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