code: def do_prompt(self, arg):
          
          if arg.lower() == 'off':
              self.response_prompt = ''
              self.prompt = ''
              return
          elif arg.lower() == 'on':
              self.prompt = PROMPT
              self.response_prompt = RESPONSE_PROMPT
          self.print_response('prompt: %s' % self.prompt, '\n', 'response: %s' % self.response_prompt)
docs: Enable or disable prompt
          :param arg: on|off
          :return: