require.py 文件源码

def require_dict(value: Optional[Dict[Any, Any]], key_type: Any=None, value_type: Any=None,
                 allow_none: bool=False) -> Any:
    """Make sure a value is a Dict[key_type, value_type].

    Used when dealing with http input data.
    """
    if value is None and allow_none:
        return value
    if type(value) != dict:
        raise InvalidData('value was %s(%s), expected dict' % (type(value), value))
    value = cast(Dict, value)
    if key_type or value_type:
        for k, v in value.items():
            if key_type and type(k) != key_type:
                raise InvalidData('dict key was %s(%s), expected %s' % (type(k), k, key_type))
            if value_type and type(v) != value_type:
                raise InvalidData('dict value was %s(%s), expected %s' % (type(v), v, key_type))
    return value