Python仅同时从列表的某些元素分配 [英] Python simultaneous assign only from some elements of a list

问题描述

在Python中，我可以这样做

In Python I can do this

w,x,y,z = (1,1,2,3)

但是假设我只需要x和y的值.有没有办法只同时分配几个变量(同时仍然保持优美的同时分配语法?).我希望能找到一些与MATLAB的波浪符号运算符相似的东西

But suppose I only need the values of x and y. Is there a way to only simultaneously assign a few variables (while still keeping the beautiful simultaneous assignment syntax?). I'm hoping to find something along the lines of MATLAB's tilde operator

~,x,y,~ = (1,1,2,3)  # This is not valid Python code

我知道我可以定义一个虚拟变量来完成此操作，

I'm aware that I can just define a dummy variable to do this,

d,x,y,d = (1,1,2,3)

但是我很好奇是否为此目的有一个特殊的运算符.

But I am curious if there is a special operator just for this purpose.

推荐答案

在Python中，做您正在做的事情的适当方法是实际使用'_'作为您的丢弃"变量.因此，您在做什么方面非常接近.只需执行以下操作:

In Python, the appropriate way to do what you are doing is to actually make use of the '_' as your "throwaway" variable. So, you are very close in what you are doing. Simply do this:

_, x, y, _ = (1,1,2,3) 

以下是有关下划线字符的一些信息:

Here is some information on the single underscore character:

单身人士的目的是什么下划线"_" Python中的变量?

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