如果另一组值是sam，则Python添加两个特定值

Question

我正在编写一个python程序，如果“团队”相同，我必须将两个int（玩家点数）加在一起。每队有两名队员

我的列表如下所示：

list = [["team1", 10],["team2", 20],["team1", 30],["team3",0],["team2",5]]

如何将team1中的值相加，然后team2依此类推

我希望最终列表（如果是单独的列表则无所谓）如下所示：

list2 = [["team1", 40],["team2", 25],["team3",0]]

Answer 1

您可以使用^{}或^{}：

list1 = [["team1", 10],["team2", 20],["team1", 30],["team3",0],["team2",5]]

from collections import Counter, defaultdict

counter = Counter()  # alternatively: counter = defaultdict(int)
for team, score in list1:
    counter[team] += score
list2 = list(counter.items())

print(list2)
# output: [('team2', 25), ('team1', 40), ('team3', 0)]