code: def history(self, bar_count, frequency, field, ffill=True):
          
          warnings.warn(
              "The `history` method is deprecated.  Use `data.history` instead.",
              category=ZiplineDeprecationWarning,
              stacklevel=4
          )
  
          return self.get_history_window(
              bar_count,
              frequency,
              self._calculate_universe(),
              field,
              ffill
          )
docs: DEPRECATED: use ``data.history`` instead.