new_contents: from cmdtree import command, argument, INT, entry, Choices
  
  
  @command("run")
  @argument("host", type=Choices(("host1", "host2", "host3")))
  @argument("port", type=INT)
  def run_docker(host, port):
      print(
          "docker daemon api runs on {ip}:{port}".format(
              ip=host,
              port=port,
          )
      )
  
  
  if __name__ == "__main__":
      entry()
subject: Add argument type examples