argparse subparser easy use

subparser.py

def command(args):
    pass

parser = argparse.ArgumentParser()
subparser = parser.add_subparsers(title="subcommands")
command_parser = subparser.add_parser("command")
command_parser.set_defaults(func=command)
command_parser.add_argument("--dummy", help="some arg to the subcommand")

args = parser.parse_args()
if not hasattr(args, "func"):
    print("you need to specify a subcommand", file=sys.stderr)
    parser.print_help()
    sys.exit(1)

args.func(args)

"""
usage:
$ python subparser.py command --dummy "something"
"""