Autocomplete for tuple[Literal[...]] in __getitem__

[kc0506]

Description

When indexing an instance with a tuple, provide autocomplete options as if using a normal Literal type.

class A:
    def __getitem__(self, key: tuple[Literal["a", "b"], ...]):
        pass
        
A()["a",]  # autocomplete for "a"

Current behavior

• When using tuple[Literal] on normal functions, the autocomplete works.
  

• When used Literal alone on __getitem__, it also works.
  

• When combining together, it does not work. (But the type checking still works if the type is not correct.)
  

Example use case

It can provide convenience for dataframe-like objects.

class A[T, R]:
    def __init__(self, items: dict[T, R]) -> None:
        self.items = items

    def __getitem__(self, key: tuple[T, ...]) -> tuple[R, ...]:
        return tuple(self.items[k] for k in key)


class B(A[Literal["a", "b"], int]):
    pass


b = B({"a": 1, "b": 2})
b["a", "b"]  # (1, 2)

[bschnurr]

Thank you for the report.

I think is is more of an enhancement request. I'll move it to discussions for upvotes.