Allow nested tuples in isinstance/issubclass #998
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ilevkivskyi
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Mar 18, 2017
| def iter(function: Callable[[], _T], sentinel: _T) -> Iterator[_T]: ... | ||
| def isinstance(o: object, t: Union[type, Tuple[type, ...]]) -> bool: ... | ||
| def issubclass(cls: type, classinfo: Union[type, Tuple[type, ...]]) -> bool: ... | ||
| def isinstance(o: object, t: Union[type, Tuple[Union[type, Tuple], ...]]) -> bool: ... |
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@pkch @gvanrossum
I think here and below it should be Tuple[type, ...] no just Tuple at the end.
Otherwise isinstance(obj, ((1, 2), (3, 4)))will be valid.
This also applies to Python 3 stub.
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The problem is that the tuple can be arbitrarily nested. Excluding that example would also exclude isinstance(x, (((int, int), int), int)).
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OK, I still prefer the restrictive version a bit more, but this is not important. Anyway, there is no perfect solution until we support recursive types. (Btw, they are in my plans right after Protocols).
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Fixes #997