Sub arguments for argparse

argparse_test.py

#!/usr/bin/python

import argparse
 
def main():

    parser = argparse.ArgumentParser(description="Runs the script")
    subparsers = parser.add_subparsers(help='Specify secondary options')
    secondary_parser = subparsers.add_parser('secondary', help='secondary options')

    parser.add_argument("--primary",
                        help="Primary Arguments",
                        action="store_true")

    secondary_parser.add_argument('-o',
                                  '--one',
                                  help='Sub-argument one',
                                  action='store_true') 

    secondary_parser.add_argument('-t',
                                  '--two',
                                  help='Sub-argument two',
                                  action='store_true') 

    args = parser.parse_args()


if __name__ == "__main__":
    main()

results

./test.py --help
usage: test.py [-h] [--primary] {secondary} ...

Runs the script

positional arguments:
  {secondary}  Specify secondary options
    secondary  secondary options

optional arguments:
  -h, --help   show this help message and exit
  --primary    Primary Arguments