OptionParser.parse_args

parse_args(args : [string] = sys.argv[1:],
           values : Values = None)
-> (values : Values, args : [string])

Parse the command-line options found in 'args' (default:
sys.argv[1:]).  Any errors result in a call to 'error()', which
by default prints the usage message to stderr and calls
sys.exit() with an error message.  On success returns a pair
(values, args) where 'values' is a Values instance (with all
your option values) and 'args' is the list of arguments left
over after parsing options.