arg parse to trigger definition code example

Example 1: argparse list of options

parser.add_argument('--list',
                    default='all',
                    const='all',
                    nargs='?',
                    choices=['servers', 'storage', 'all'],
                    help='list servers, storage, or both (default: %(default)s)')

Example 2: python argparser flags

parser.add_argument("-v", "--verbose", action="store_true",
                    help="verbose output")