随机 Python 字典键，按值加权 [英] Random Python dictionary key, weighted by values

问题描述

我有一个字典，其中每个键都有一个可变长度的列表，例如:

I have a dictionary where each key has a list of variable length, eg:

d = {
 'a': [1, 3, 2],
 'b': [6],
 'c': [0, 0]
}

有没有一种干净的方法来获取随机字典键，按其值的长度加权?random.choice(d.keys()) 将平均加权密钥，但在上述情况下，我希望 'a' 大约有一半的时间返回.

Is there a clean way to get a random dictionary key, weighted by the length of its value? random.choice(d.keys()) will weight the keys equally, but in the case above I want 'a' to be returned roughly half the time.

推荐答案

这行得通:

random.choice([k for k in d for x in d[k]])

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