如何从字典中获取价值最高的3个项目? [英] How to get the 3 items with the highest value from dictionary?

问题描述

假设我有这本字典: {"A":3，"B":4，"H":1，"K":8，"T":0}

Suppose i have this dictionary: {"A":3,"B":4,"H":1,"K":8,"T":0}

我想获得最高3个值的键(因此在这种情况下，我将获得键:K B和A)

I want to get the keys of the highest 3 values (so in this case I will get the keys: K B and A)

推荐答案

您可以将简单的 list理解表达式用作:

You may use simple list comprehension expression as:

>>> sorted(my_dict, key=my_dict.get, reverse=True)[:3]
['K', 'B', 'A']

或者，您可以使用 collections.Counter() 您也需要价值:

OR, you may use collections.Counter() if you need value as well:

>>> from collections import Counter
>>> my_dict = {"A":3,"B":4,"H":1,"K":8,"T":0}
>>> c = Counter(my_dict)
>>> mc = c.most_common(3)  # returns top 3 values
# content of mc: [('K', 8), ('B', 4), ('A', 3)]

# For getting the keys from "mc":
# >>> [key for key, val in mc]
# ['K', 'B', 'A']

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