code: def get_members(self, sort='id_asc'):
          
          return self._session.fetch_items("groups.getMembers", User.from_json, 1000, group_id=self.id, sort=sort, fields=User.__slots__ + User.USER_FIELDS)
docs: :param: sort {id_asc, id_desc, time_asc, time_desc} string
          Docs: https://vk.com/dev/groups.getMembers