函数返回值定义 #多个返回值 - Tuple #async def function_name(package_name: str) -> Tuple[ParamsPushLvl2Pool, bool]: pass 支持传入多类型 - Union #ex: Union[ExpiryT, None] = None, 迭代 #def _yield_offer_info(_session, from_days_ago: int) -> Iterator[Offer]: