Using `type` to create the sentinel between 3.12 to 3.14?

Python Help
1

I found the way to replace sentinel between 3.12 to 3.14:

type _MISSING = _MISSING


def my_func(need_value: int, not_need_value: str | _MISSING = _MISSING) -> None:
    if not_need_value is _MISSING:
        print(f"No 'not_need_value'. The 'need_value' is {need_value}")
        return
    print(f"'not_need_value' is {not_need_value} and 'need_value' is {need_value}")

The behavior in runtime is great. The only question is that type checking doesn’t think that it is OK. So is it the great way to create the sentinel value?

1 Like