Descriptors

import typing

_T = typing.TypeVar("_T")


class Mapped(typing.Generic[_T]):
    """Returns type for class attribute and actual value for instance."""

    if typing.TYPE_CHECKING:

        @typing.overload
        def __get__(self, instance: None, owner: typing.Any) -> type[_T]:
            ...

        @typing.overload
        def __get__(self, instance: object, owner: typing.Any) -> _T:
            ...

        def __get__(
            self, instance: object, owner: typing.Any
        ) -> typing.Union[type[_T], _T]:
            ...