code: def parse_args(self, args=None):
          
          if args is None:
              args = sys.argv[1:]
          return self.parser.parse_known_args(args)
docs: Parse the given arguments
  
          All commands should support executing a function,
          so you can use the arg Namespace like this::
  
            launcher = Launcher()
            args, unknown = launcher.parse_args()
            args.func(args, unknown) # execute the command
  
          :param args: arguments to pass
          :type args:
          :returns: the parsed arguments and all unknown arguments
          :rtype: (Namespace, list)
          :raises: None