require.py 文件源码

def require_bool(value: Optional[Union[bool, str, int]], convert: bool=False, allow_none: bool=False) -> Any:
    """Make sure a value is a boolean.

    Used when dealing with http input data.
    """
    if value is None and allow_none:
        return value
    if type(value) != bool:
        if not convert:
            raise InvalidData()
        if value in [None, 0, '0', 'false', 'False']:
            value = False
        elif value in [1, '1', 'true', 'True']:
            value = True
        else:
            raise InvalidData('value was %s(%s), expected bool' % (type(value), value))
    return cast(bool, value)