docs: def _get_retro_id(cls, home_team_id, timestamp, game_number):
          """
          get retro id
          :param home_team_id: home team id
          :param timestamp: game day
          :param game_number: game number
          :return: retro id
          """
          return '{home_team_id}{year}{month}{day}{game_number}'.format(
              **{
                  'home_team_id': home_team_id.upper(),
                  'year': timestamp.year,
                  'month': timestamp.strftime('%m'),
                  'day': timestamp.strftime('%d'),
                  'game_number': int(game_number)-1,
              }
          )