code: def downloads_per_day(self):
          
          count, num_days = self._downloads_for_num_days(7)
          res = ceil(count / num_days)
          logger.debug("Downloads per day = (%d / %d) = %d", count, num_days, res)
          return res
docs: Return the number of downloads per day, averaged over the past 7 days
          of data.
  
          :return: average number of downloads per day
          :rtype: int