code: def users(self):
          
          if self._users is None:
              self._users = UserList(self._version, service_sid=self._solution['sid'], )
          return self._users
docs: Access the users
  
          :returns: twilio.rest.chat.v2.service.user.UserList
          :rtype: twilio.rest.chat.v2.service.user.UserList