[issue46669] Add types.Self

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

On a related note, is this the correct way to annotate __exit__?


Exc = TypeVar('Exc', bound=Exception)

def __exit__(self, exctype: Optional[Type[Exc]], excinst: Optional[Exc], exctb: Any) -> None:

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