code: def total_scores_in(self, leaderboard_name):
          '''
          Sum of scores for all members in the named leaderboard.
  
          @param leaderboard_name Name of the leaderboard.
          @return Sum of scores for all members in the named leaderboard.
          '''
          return sum([leader[self.SCORE_KEY] for leader in self.all_leaders_from(self.leaderboard_name)]f total_scores_in(self, leaderboard_name):
          '''
          Sum of scores for all members in the named leaderboard.
  
          @param leaderboard_name Name of the leaderboard.
          @return Sum of scores for all members in the named leaderboard.
          '''
          return sum([leader[self.SCORE_KEY] for leader in self.all_leaders_from(self.leaderboard_name)])
docs: Sum of scores for all members in the named leaderboard.
  
          @param leaderboard_name Name of the leaderboard.
          @return Sum of scores for all members in the named leaderboard.