Type hint that excludes a certain type

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In Python, is it possible to declare a type hint that excludes certain types from matching? For example, is there a way to declare a type hint that is "typing.Iterable except not str" or the like?

python types
1 Answers

python type hinting does not support excluding types, however you can use Union type to specify the types you want to get.

So something like:

def x(x: Iterable[Union[int, str, dict]]):
    pass

x([1]) # correct
x([1, ""]) # correct
x([None]) # not correct

A way to make Union[] shorter if you want to get all types except something you can do:

expected_types = Union[int, str, dict]


def x(x: Iterable[expected_types]):
    pass

This works just like the above code.

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