code: def status(self):
          
          try:
              return self.__dict__["status"]
          except (KeyError, ValueError):
              raise AttributeError(
                  "Instrument(order_book_id={}) has no attribute 'status' ".format(self.order_book_id)
              )
docs: [str] 合约状态。’Active’ - 正常上市, ‘Delisted’ - 终止上市, ‘TemporarySuspended’ - 暂停上市,
          ‘PreIPO’ - 发行配售期间, ‘FailIPO’ - 发行失败（股票专用）