Pythonコマンドラインパラメータモジュールargparseの使い方

def add_argument(self,
                 *name_or_flags: str,
                 action: Union[str, Type[Action]] = ...,
                 nargs: Union[int, str] = ...,
                 const: Any = ...,
                 default: Any = ...,
                 type: Union[(str) -> _T, (str) -> _T, FileType] = ...,
                 choices: Iterable[_T] = ...,
                 required: bool = ...,
                 help: Optional[str] = ...,
                 metavar: Union[str, Tuple[str, ...], None] = ...,
                 dest: Optional[str] = ...,
                 version: str = ...,
                 **kwargs: Any) -> Action

parser=argparse.ArgumentParser("python")
parser.add_argument("-p", "--port",help="port to listen",type=int,nargs=5,dest="ports")
args=parser.parse_args()
print(args.ports,type(args.ports))

    parser.add_argument("-p", "--port",help="port to listen",default=8080,type=int,dest="ports")
    args=parser.parse_args()
    print(args.ports,type(args.ports))

parser.add_argument("-p", "--port",help="port to listen",required=True,type=int,dest="ports")

    parser=argparse.ArgumentParser("python")
    parser.add_argument("-p", "--port",help="port to listen",required=True,type=int,dest="ports")
    parser.add_argument("-f","--flags",action="store_true")
    args=parser.parse_args()
    print(args.ports,type(args.ports),args.flags)

parser.add_argument("-l",choices="12345")
choices,参数l的取值只能是12345，1，2，3，4，5，12，123，1234等，不能是其它，不能乱序