parser.add_argument('-u', '--up-sound', metavar='FILENAME', help=
    """The sound to play when the network comes up. Default:"%(default)s\"
""",
    default='/path/to/some/sound/file.wav')
parser.add_argument('-d', '--down-sound', metavar='FILENAME', help=
    'The sound to play when the network goes down. Default:"%(default)s"',
    default='/path/to/some/other/sound/file.wav')
parser.add_argument('-s', '--silent', action='store_true', help=
    'If specified, network_monitor.py will not play any sounds.')
parser.add_argument('positional', nargs='*', help='positional argument')
parser.print_help()
Python argparse: Insert blank line between help entries