python中的a=b=c是什么? [英] What is a=b=c in python?

问题描述

我很困惑，连续相等的=可以在python中使用，例如:

a = b = c

这个语言功能叫什么?有什么我可以阅读的内容吗?

可以生成4个等号吗?

a = b = c = d

解决方案

这只是将 a 和 b 声明为等于 c.

<预><代码>>>>c=2>>>a=b=c>>>一种2>>>乙2>>>C2

所以你可以随心所欲地使用:

<预><代码>>>>我=7>>>a=b=c=d=e=f=g=h=i

您可以在此 Python 教程的多重赋值中阅读更多内容.

<块引用>

Python 允许您将单个值分配给多个变量同时.例如:

a = b = c = 1

这里创建了一个值为 1 的整数对象，并且所有三个变量被分配到相同的内存位置.你也可以将多个对象分配给多个变量.例如:

a, b, c = 1, 2, "约翰"

这里，两个值为 1 和 2 的整数对象被分配给变量 a 和 b，一个值为john"的字符串对象是分配给变量 c.

<小时>

还有一个花哨的东西！您可以像这样交换值:a,b=b,a:

<预><代码>>>>a=2>>>b=5>>>a,b=b,a>>>一种5>>>乙2

I am quite confused, consecutive equal = can be used in python like:

a = b = c

What is this language feature called? Is there something I can read about that?

Can it be generated into 4 equals?

a = b = c = d

解决方案

This is just a way to declare a and b as equal to c.

>>> c=2
>>> a=b=c
>>> a
2
>>> b
2
>>> c
2

So you can use as much as you want:

>>> i=7
>>> a=b=c=d=e=f=g=h=i

You can read more in Multiple Assignment from this Python tutorial.

Python allows you to assign a single value to several variables simultaneously. For example:

a = b = c = 1

Here, an integer object is created with the value 1, and all three variables are assigned to the same memory location. You can also assign multiple objects to multiple variables. For example:

a, b, c = 1, 2, "john"

Here, two integer objects with values 1 and 2 are assigned to variables a and b, and one string object with the value "john" is assigned to the variable c.

---

There is also another fancy thing! You can swap values like this: a,b=b,a:

>>> a=2
>>> b=5
>>> a,b=b,a
>>> a
5
>>> b
2

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