code: def main(argv=None):
      
  
      if argv is None:
          argv = sys.argv[1:]
  
      parser = build_args()
      args = parser.parse_args(args=argv)
      verbosity = args.verbose
  
      root = logging.getLogger()
  
      formatter = logging.Formatter('%(levelname).6s %(name)s %(message)s')
      handler = logging.StreamHandler()
      handler.setFormatter(formatter)
  
      loglevels = [logging.ERROR, logging.WARNING, logging.INFO, logging.DEBUG]
      if verbosity >= len(loglevels):
          verbosity = len(loglevels) - 1
  
          level = loglevels[verbosity]
          root.setLevel(level)
          root.addHandler(handler)
      else:
          root.addHandler(logging.NullHandler())
  
      try:
          with open(args.script, "rb") as infile:
              binary_script = infile.read()
      except IOError as exc:
          print("ERROR: Unable to read script file: %s" % str(exc))
          return 1
  
      try:
          script = UpdateScript.FromBinary(binary_script, allow_unknown=args.allow_unknown, show_rpcs=args.show_rpcs)
      except ArgumentError as err:
          print("ERROR: ArgumentError: could not parse script")
          print(str(err))
          return 3
      except DataError as err:
          print("ERROR: DataError: could not parse script")
          print(str(err))
          return 4
  
      if args.format != 'text':
          print("ERROR: only text format is currently supported")
          return 2
  
      if args.format == 'text':
          print("\nUpdate Script")
          print("-------------")
          print("Path: %s" % args.script)
          print("Record Count: %d" % len(script.records))
          print("Total length: %d bytes" % len(binary_script))
  
          print("\nActions")
          print("-------")
  
          for i, record in enumerate(script.records):
              print("%02d: %s" % (i + 1, str(record)))
  
          print("")
  
      return 0
docs: Main script entry point.
  
      Args:
          argv (list): The command line arguments, defaults to sys.argv if not passed.
  
      Returns:
          int: The return value of the script.