在python中设置理解 [英] Set Comprehension in python

问题描述

在 Python3 中我写了一个简单的一行代码如下:

In Python3 I wrote a simple one line code as follows :

{ 2*x  for x in {1,2,3,4} } 

但我得到了这样的答案(顺序改变了).

but I m getting answer like this (order changed).

{8, 2, 4, 6}

为什么我得到的答案是 {8,2,4,6} 而不是 {2,4,6,8}?

Why I am getting answer {8,2,4,6} instead of {2,4,6,8}?

推荐答案

那是因为集合没有任何顺序.它们是无序集合.

That's because sets don't have any order. They're unordered collection.

set 的帮助:

构建一个无序独特元素的集合.

Build an unordered collection of unique elements.

如果您希望保留订单，则可以在此处使用 list、tuple 或 collections.OrderedDict.

If you want the order to be preserved then you can use list, tuple or collections.OrderedDict here.

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