python - 查找多个值相同的元组的最大值

Question

我有一个元组列表，我需要找到右侧具有最大值的元组。我还需要程序打印出具有该最大值的每个元组。我尝试过使用 lambda，但这只返回左侧具有最大值的元组之一。具体来说，我尝试过:

max(TotalFriendsList,key=lambda x:x[1])

返回(1,3)

这是列表:

[(0, 2),
 (1, 3),
 (2, 3),
 (3, 3),
 (4, 2),
 (5, 3),
 (6, 2),
 (7, 2),
 (8, 3),
 (9, 1)]

这是我需要的输出:

[(1,3),
(2,3),
(3,3),
(5,3),
(8,3)]

谢谢!

Answer 1

您可以通过获取最高值，然后获取相应的元组来保持此相当紧凑:

l = [(0, 2),
     (1, 3),
     (2, 3),
     (3, 3),
     (4, 2),
     (5, 3),
     (6, 2),
     (7, 2),
     (8, 3),
     (9, 1)]

# pass a generator expression to `max`
greatest = max(item[1] for item in l)

# "filter" `l`, keeping only tuples that have the greatest value as their second element
result = [item for item in l if item[1] == greatest]
print(result)
# [(1, 3), (2, 3), (3, 3), (5, 3), (8, 3)]