Jack DeVries <jdevries3...@gmail.com> added the comment:
I think this already works unless you are using TypeVars::
t = Union[str, int]
isinstance(1, t) # True
isinstance('1', t) # True
If you are using TypeVars, though, it cannot work:
T = TypeVar('my_type')
thing = Union[T, str]
isinstance('hi', thing) # Exception
This makes sense, because ``T`` is just a name, not related to an actual object.
Sorry if I'm missing something, because I did try the non-working example and
my exception actually says, "issubclass() arg 2 must be a class, a tuple of
classes, or a union." The exception makes sense, but its difference from yours
might mean I'm doing something differently.
----------
nosy: +jack__d
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<https://bugs.python.org/issue44529>
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