code: def _add_rank_score(self, variant_obj, info_dict):
          
          rank_score_entry = info_dict.get('RankScore')
          if rank_score_entry:
              for family_annotation in rank_score_entry.split(','):
                  rank_score = family_annotation.split(':')[-1]
              logger.debug("Updating rank_score to: {0}".format(
                  rank_score))
              variant_obj.rank_score = float(rank_score)
docs: Add the rank score if found
          
          Args:
              variant_obj (puzzle.models.Variant)
              info_dict (dict): A info dictionary