我要回家想一想~

from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument("command", help="command argument")
parser.add_argument("file_path", help="json file path")
parser.add_argument("reason", help="reason")
# optional position argument
parser.add_argument("language", nargs='?', help="optional language argument", default="ENG")

args = parser.parse_args()
print("positional arg:", args.command)
print("optional arg:", args.language)