Using Python argparse to create subparsers, allowing sub commands similar to pip, git, and brew.

command.py

import argparse


def main():
    """Do something important."""

    parser = argparse.ArgumentParser(description=main.__doc__)
    
    subparsers = parser.add_subparsers(
        dest="subcommand",
        metavar="sub1, sub2, sub3",
        help='Sub-Commands'
    )
    
    sub1 = subparsers.add_parser(
        "sub1",
        help="Work with sub1 commands."
    )
    
    sub1.add_argument(
        "--init",
        action="store_true",
        dest="initialize_sub1",
        help="Initialize something related to sub1."
    )
    
    args = parser.parse_args()
    
if __name__ == "__main__":
    main()