Because this PEP propose to accept, for all classes
assert isinstance("", int | str)
assert issubclass(int, int | str)
and add an operator __or__() for type type.
def f(list: List[int | str], param: int | None) -> float | str:
pass
Regards
Philippe
Le lun. 7 oct. 2019 à 17:29, Random832 <random...@fastmail.com> a écrit :
> On Mon, Oct 7, 2019, at 10:32, Philippe Prados wrote:
> > Hello,
> >
> > I try to implement a *proof of concept* of Pep-0604
> > <https://www.python.org/dev/peps/pep-0604/>.
> >
> > To do this, the _GenericAlias must be in builtin, because I would like
> > to update issubclass() and isinstance() to accept Union.
> > These methods are in builtin, and must be run without others modules.
>
> Why can't this be handled as an __instancecheck__/__subclasscheck__?
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