设置为 dict Python

Set to dict Python(设置为 dict Python)

问题描述

有没有 Pythonic 方法可以将集合转换为字典?

is there any pythonic way to convert a set into a dict?

我得到了以下套装

s = {1,2,4,5,6}

并且想要下面的字典

c = {1:0, 2:0, 3:0, 4:0, 5:0, 6:0}

有一个你会做的清单

a = [1,2,3,4,5,6]
b = []

while len(b) < len(a):
   b.append(0)

c = dict(itertools.izip(a,b))

推荐答案

使用 dict.fromkeys():

c = dict.fromkeys(s, 0)

演示:

>>> s = {1,2,4,5,6}
>>> dict.fromkeys(s, 0)
{1: 0, 2: 0, 4: 0, 5: 0, 6: 0}

这也适用于列表；这是从序列创建字典的最有效方法.请注意，所有值都是对您传递给 dict.fromkeys() 的默认值的引用，因此当该默认值是可变对象时要小心.

This works for lists as well; it is the most efficient method to create a dictionary from a sequence. Note all values are references to that one default you passed into dict.fromkeys(), so be careful when that default value is a mutable object.

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