Python用于对求和的字典列表值进行排序

Question

我无法将我的求和值从最高到最低排序.

dict设置如下:

dictionary = {name:[dollar amount 1, dollar amount 2, etc.]}

我需要将美元金额相加并按降序打印结果(按总金额计算).

目前我用这个:

for pair in dictionary:
    print(pair, f'{sum(dictionary[pair]):.2f}')

我不知道现在在哪里或如何排序,我只是模糊地熟悉lambda的用法.

谢谢!

Answer 1

您可以使用字典理解,然后sorted通过for循环迭代:

from operator import itemgetter

# input dictionary; create new dictionary with values totalled
d = {'Joe': [5, 10, 15], 'Paul': [2, 5, 1], 'Andrew': [5, 20, 15]}
d_sums = {k: sum(v) for k, v in d.items()}

# sort by value descending and iterate, gives list of tuples
sums_sorted = sorted(d_sums.items(), key=itemgetter(1), reverse=True)

# iterate and print
for name, dollars in sums_sorted:
    print(f'{name} {dollars}')

# Andrew 40
# Joe 30
# Paul 8