tuple.__new__ does not accept class with only __getitem__ method

[JonathanPlasse]

Currently the tuple constructor only accepts iterables.

typeshed/stdlib/builtins.pyi

Lines 932 to 933 in 97ccd89

	class tuple(Sequence[_T_co]):
	def __new__(cls, iterable: Iterable[_T_co] = ..., /) -> Self: ...

But the tuple constructor can also take in classes that only have the __getitem__ method and is not iterable.

class A:
    def __getitem__(self, key):
        if key >= 3:
            raise IndexError
        return key

print(tuple(A()))  # (0, 1, 2)

A _GetItemIterable could be added to tuple.__new__ signature like for iter.

typeshed/stdlib/builtins.pyi

Lines 1424 to 1431 in 97ccd89

	@overload
	def iter(object: SupportsIter[_SupportsNextT], /) -> _SupportsNextT: ...
	@overload
	def iter(object: _GetItemIterable[_T], /) -> Iterator[_T]: ...
	@overload
	def iter(object: Callable[[], _T | None], sentinel: None, /) -> Iterator[_T]: ...
	@overload
	def iter(object: Callable[[], _T], sentinel: object, /) -> Iterator[_T]: ...

I am open to make a PR to fix it.

[AlexWaygood]

Sort of a duplicate of #7813, which we closed as "wontfix" (see detailed discussion in that issue for why :-)

[JonathanPlasse]

Thank you, I need to improve my issue searching methodology.