old_contents: from .entity import SingleEntity, EntitiesList
  from .repository.dataset_repo import get_dataset_repo
  from .repository.geography_repo import get_geography_repo
  
  _GEOGRAPHY_ID_FIELD = 'id'
  
  
  class Geography(SingleEntity):
  
      id_field = _GEOGRAPHY_ID_FIELD
      entity_repo = get_geography_repo()
  
      @classmethod
      def _get_entities_list_class(cls):
          return Geographies
  
      def datasets(self):
          return get_dataset_repo().get_by_geography(self._get_id())
  
  
  class Geographies(EntitiesList):
  
      id_field = _GEOGRAPHY_ID_FIELD
      entity_repo = get_geography_repo()
  
      @classmethod
      def _get_single_entity_class(cls):
          return Geography
new_contents: from .entity import SingleEntity, EntitiesList
  from .repository.dataset_repo import get_dataset_repo
  from .repository.geography_repo import get_geography_repo
  
  _GEOGRAPHY_ID_FIELD = 'id'
  
  
  class Geography(SingleEntity):
  
      id_field = _GEOGRAPHY_ID_FIELD
      entity_repo = get_geography_repo()
  
      @classmethod
      def _get_entities_list_class(cls):
          return Geographies
  
      def datasets(self):
          return get_dataset_repo().get_by_geography(self._get_id())
  
  
  class Geographies(EntitiesList):
  
      id_field = _GEOGRAPHY_ID_FIELD
      entity_repo = get_geography_repo()
  
      @classmethod
      def _get_single_entity_class(cls):
          return Geography
  
subject: Add missing blank line