code: def execute():
      
  
      arg_parser = ArgumentParser(description='Install helper tool to download the right version of the ANTLR v4 tool jar.')
  
      arg_parser.add_argument('--version', action='version', version='%(prog)s {version}'.format(version=__version__))
  
      mode_group = arg_parser.add_mutually_exclusive_group()
      mode_group.add_argument('-f', '--force', action='store_true', default=False,
                              help='force download even if local antlr4.jar already exists')
      mode_group.add_argument('-l', '--lazy', action='store_true', default=False,
                              help='don\'t report an error if local antlr4.jar already exists and don\'t try to download it either')
  
      args = arg_parser.parse_args()
  
      install(force=args.force, lazy=args.lazy)
docs: Entry point of the install helper tool to ease the download of the right
      version of the ANTLR v4 tool jar.