validate.py 文件源码

def validate_type(data, type_):
    instance_check = False
    abstract_types = {typing.AbstractSet, typing.Sequence, typing.Mapping}
    if hasattr(type_, '__origin__') and type_.__origin__ in abstract_types:
        param_type = get_abstract_param_types(type_)
        imp_types = {
            typing.AbstractSet: collections.Set,
            typing.Sequence: collections.Sequence,
            typing.Mapping: collections.Mapping,
        }
        instance_check = isinstance(data, imp_types[type_.__origin__]) and \
            all(isinstance(item, param_type[0]) for item in data)
    else:
        try:
            instance_check = isinstance(data, type_)
        except TypeError:
            if is_union_type(type_):
                instance_check = any(
                    isinstance(data, t) for t in get_union_types(type_)
                )
            else:
                raise ValueError('{!r} cannot validated.'.format(type_))
    return instance_check