foo_test.py

#!/usr/bin/env python3
# vim: fileencoding=utf-8


from argparse import ArgumentParser


def setup(*args):
    print(args)


def run(*args):
    print(args)


def teardown(*args):
    print(args)


def main():
    parser = ArgumentParser()
    parser.add_argument('http_url')

    subparser = parser.add_subparsers()

    update = subparser.add_parser('setup')
    update.set_defaults(func=setup)

    params = parser.parse_args()
    if hasattr(params, 'func'):
        success = params.func(params)
        return 0 if success else 1
    else:
        parser.print_help()


if __name__ == '__main__':
    main()