code: def _set_axis(self, axis, labels, fastpath=False):
          
  
          if not fastpath:
              labels = ensure_index(labels)
  
          is_all_dates = labels.is_all_dates
          if is_all_dates:
              if not isinstance(labels,
                                (DatetimeIndex, PeriodIndex, TimedeltaIndex)):
                  try:
                      labels = DatetimeIndex(labels)
                      # need to set here because we changed the index
                      if fastpath:
                          self._data.set_axis(axis, labels)
                  except (tslibs.OutOfBoundsDatetime, ValueError):
                      # labels may exceeds datetime bounds,
                      # or not be a DatetimeIndex
                      pass
  
          self._set_subtyp(is_all_dates)
  
          object.__setattr__(self, '_index', labels)
          if not fastpath:
              self._data.set_axis(axis, labels)
docs: Override generic, we want to set the _typ here.