code: def main():
      
      parser = dsargparse.ArgumentParser(main=main)
      subparsers = parser.add_subparsers()
  
      greeting_cmd = subparsers.add_parser(greeting)
      greeting_cmd.add_argument("title")
      greeting_cmd.add_argument("name")
  
      goodbye_cmd = subparsers.add_parser(goodbye)
      goodbye_cmd.add_argument("name")
  
      return parser.parse_and_run()
docs: The main function.