code: def main(args):
      
  
      args = _parse_args(args)
  
      # sort out logging output and level
      level = util.log_level_from_vebosity(args.verbosity)
      root = logging.getLogger()
      root.setLevel(level)
      handler = logging.StreamHandler(sys.stdout)
      handler.setLevel(level)
      handler.setFormatter(logging.Formatter('%(levelname)s %(message)s'))
      root.addHandler(handler)
  
      logger.debug(args)
  
      expression = ' '.join(args.expression)
      try:
          print(Parser().parse(expression))
      except (LexingError, ParsingError) as e:
          util.print_error(e)
          return 1
  
      return 0
docs: Nibble's entry point.
  
      :param args: Command-line arguments, with the program in position 0.