如何在字典中获取多个最大键值? [英] How to get multiple max key values in a dictionary?

问题描述

假设我有一本字典:

data = {'a':1, 'b':2, 'c': 3, 'd': 3}

我想获取字典中的最大值.到目前为止，我一直在做:

I want to get the maximum value(s) in the dictionary. So far, I have been just doing:

max(zip(data.values(), data.keys()))[1]

但我知道我可能会错过另一个最大值.解决这个问题的最有效方法是什么?

but I'm aware that I could be missing another max value. What would be the most efficient way to approach this?

推荐答案

根据您的示例，您似乎正在寻找映射到最大值的键.可以使用列表理解:

Based on your example, it seems like you're looking for the key(s) which map to the maximum value. You could use a list comprehension:

[k for k, v in data.items() if v == max(data.values())]
# ['c', 'd']

如果你有一个很大的字典，把它分成两行，以避免为尽可能多的项目计算最大值:

If you have a large dictionary, break this into two lines to avoid calculating max for as many items as you have:

mx = max(data.values())
[k for k, v in data.items() if v == mx]

在 Python 2.x 中，您将需要 .iteritems().

In Python 2.x you will need .iteritems().

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