With PEP 563, there's no runtime behaviors. It's strange to accept :
def f() -> int | str: ... but not a = int | str The operator type.__or__() is called only if the user known what they do. it's strictly equivalent to a = Union[int,str] So, I think it's important to add this operator in root type. Le jeu. 29 août 2019 à 14:55, Inada Naoki <songofaca...@gmail.com> a écrit : > I don't want to add runtime behaviors for static type hinting. > > There is PEP 563 instead. > Tools like mypy can implement them without touching runtime behavior. > > > -- > Inada Naoki <songofaca...@gmail.com> >
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