获取字典中每个键的最大值 python

Question

我有以下字典，我想输出每个键的最大值：

yo = {'is': [1, 3, 4, 8, 10],
             'at': [3, 10, 15, 7, 9],
             'test': [5, 3, 7, 8, 1],
             'this': [2, 3, 5, 6, 11]}

例如，输出应如下所示

[10, 15, 8, 11]
or 
['is' 10, 'at' 15, 'test' 8, 'this' 11]

Answer 1

使用list comprehension:

result = [max(v) for k,v in yo.items()]
# PRINTS [10, 15, 8, 11]

或dict comprehension:

result_dict = {k:max(v) for k,v in yo.items()}
# Prints {'is': 10, 'at': 15, 'test': 8, 'this': 11}

Answer 2

万一字典有任何键的空列表，你可以在字典压缩中对长度进行安全检查以消除对

result = [max(v) for v in yo.values() if len(v)>0]
result_dict = {k:max(v) for k,v in yo.items() if len(v)>0}

Getting the max value for each key in a dictionary python