code: def _get_griddistrict(ding0_filepath):
      
      grid_district = os.path.basename(ding0_filepath)
      grid_district_search = re.search('[_]+\d+', grid_district)
      if grid_district_search:
          grid_district = int(grid_district_search.group(0)[2:])
          return grid_district
      else:
          raise (KeyError('Grid District not found in '.format(grid_district)))
docs: Just get the grid district number from ding0 data file path
  
      Parameters
      ----------
      ding0_filepath : str
          Path to ding0 data ending typically
          `/path/to/ding0_data/"ding0_grids__" + str(``grid_district``) + ".xxx"`
      Returns
      -------
      int
          grid_district number