Python _optional Examples

Example #1

    class Config:
        foo: Optional[float] = field(
            default=None,
            metadata={
                'validate': _optional(_chain(_of_type(int, float), _positive)),
            },
        )

        def __post_init__(self):
            _validate(self)

Example #2

    class Config:
        foo: Optional[float] = field(
            default=cast(None, _DEFAULT),
            metadata={
                'validate': _optional(_chain(_of_type(int, float), _positive)),
                'test-default': 1234,
            },
        )

        def __post_init__(self):
            _validate(self)