docs: def get_data_dict_from_config(self, config_dict):
          """Return a dictionary of data inferred from config_dict."""
          return {
              key: self.parsedpage.get_filtered_values_by_selector(
                  item_dict['selector'],
                  item_dict.get('regex_filter', None),
                  item_dict.get('regex_group', 1)
              )
              for key, item_dict in config_dict.iteritems()
              if item_dict.get('selector', None) is not None
          }