Not() operator, to match anything but the state

[HarryR]

As titled, it would be good to have a Not operation, so you can match in anything but the specified value.

This could be combined with a OneOf operator, e.g. Not(OneOf(1, 2, 3))

[santinic]

+1 good idea

[yjqiang]

Maybe we can make it in this way?

class Not:
    __slots__ = ('_value',)

    def __init__(self, value):
        self._value = value

    def __call__(self, value) -> bool:
        return self._value != value