code: def load_variable(self, var=None, start_date=None, end_date=None,
                        time_offset=None, grid_attrs=None, **DataAttrs):
          
          file_set = self._generate_file_set(var=var, start_date=start_date,
                                             end_date=end_date, **DataAttrs)
          ds = _load_data_from_disk(
              file_set, self.preprocess_func, data_vars=self.data_vars,
              coords=self.coords, start_date=start_date, end_date=end_date,
              time_offset=time_offset, grid_attrs=grid_attrs, **DataAttrs
          )
          if var.def_time:
              ds = _prep_time_data(ds)
              start_date = times.maybe_convert_to_index_date_type(
                  ds.indexes[TIME_STR], start_date)
              end_date = times.maybe_convert_to_index_date_type(
                  ds.indexes[TIME_STR], end_date)
          ds = set_grid_attrs_as_coords(ds)
          da = _sel_var(ds, var, self.upcast_float32)
          if var.def_time:
              da = self._maybe_apply_time_shift(da, time_offset, **DataAttrs)
              return times.sel_time(da, start_date, end_date).load()
          else:
              return da.load()
docs: Load a DataArray for requested variable and time range.
  
          Automatically renames all grid attributes to match aospy conventions.
  
          Parameters
          ----------
          var : Var
              aospy Var object
          start_date : datetime.datetime
              start date for interval
          end_date : datetime.datetime
              end date for interval
          time_offset : dict
              Option to add a time offset to the time coordinate to correct for
              incorrect metadata.
          grid_attrs : dict (optional)
              Overriding dictionary of grid attributes mapping aospy internal
              names to names of grid attributes used in a particular model.
          **DataAttrs
              Attributes needed to identify a unique set of files to load from
  
          Returns
          -------
          da : DataArray
               DataArray for the specified variable, date range, and interval in