types.py 文件源码

def _metaclass_check_getitem_type_decl(cls, type_decl):
        # 1. Iterator[T, ...]
        if isinstance(type_decl, tuple):
            for T in type_decl:
                if nontype_object(T):
                    return False
            return True

        # 2. Iterator[T]
        elif type_object(type_decl):
            return True

        else:
            return False