Python 中的元组是不可变的吗? [英] Are tuples in Python immutable?

问题描述

它说

<块引用>

元组一旦创建就不能以任何方式更改.

但是当我执行以下操作时:

t1=(4,5,8,2,3)t1=t1+(7,1)打印(t1)

元组正在更改为 (4, 5, 8, 2, 3, 7, 1);这是为什么?元组不可变"的真正含义是什么?

解决方案

是的，元组是不可变的；一旦创建，就无法更改.t1=t1+(7,1) 创建一个新元组并将其分配给名称t1.它不会更改最初由该名称引用的元组对象.

演示:

<预><代码>>>>t = (1, 2, 3)>>>编号(t)4365928632>>>t = t + (4, 5)>>>编号(t)4354884624 #不同的id，不同的对象

It says

A tuple can not be changed in any way once it is created.

But when I do the following:

t1=(4,5,8,2,3)
t1=t1+(7,1)
print(t1)

the tuple is changing to (4, 5, 8, 2, 3, 7, 1); why is that? What is really meant by "tuples are immutable"?

解决方案

Yes, tuples are immutable; once created, they cannot be changed. t1=t1+(7,1) creates a new tuple and assigns it to the name t1. It does not change the tuple object originally referenced by that name.

Demo:

>>> t = (1, 2, 3)
>>> id(t)
4365928632
>>> t = t + (4, 5)
>>> id(t)
4354884624 # different id, different object

这篇关于Python 中的元组是不可变的吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！