get_origin(str|None) != get_origin(Union[str,None])

[moi90]

Bug report

Bug description:

There seems to be a bug with str|None vs Union[str,None] / Optional[str]:

from typing import Union, get_origin

assert get_origin(str|None) == get_origin(Union[str,None])

get_origin(str|None)
# <class 'types.UnionType'>

get_origin(Union[str,None])
Union

This is unexpected to me and I think this is an error.

I verified this behavior on 3.10, 3.11 and 3.12.

CPython versions tested on:

3.10, 3.11, 3.12

Operating systems tested on:

Linux

[Eclips4]

Hello!
There's no bug since it's really different types, although semantically they are the same.
After merge of #105511 this problem will gone.
cc @JelleZijlstra

[JelleZijlstra]

Duplicate of #105499.

[moi90]

Thanks for the info! So currently, one needs to do get_origin(...) in (Union, UnionType) to check whether an annotation is any kind of union?

[Eclips4]

Thanks for the info! So currently, one needs to do get_origin(...) in (Union, UnionType) to check whether an annotation is any kind of union?

Yes.