python列表复制是深层复制还是浅层复制，如何完成? [英] python lists copying is it deep copy or Shallow copy and how is it done?

问题描述

Deep copy如何在python列表中完成?

How is Deep copy being done in python for lists?

我对复制列表有些困惑.使用浅拷贝还是深拷贝? 另外，子列表的语法是什么?是g=a[:]吗?

I am a little confused for copying of lists. Is it using shallow copy or deep copy? Also, what is the syntax for sublists? is it g=a[:]?

推荐答案

新列表是引用的副本. g[0]和a[0]都引用相同的对象.因此，这是一个浅表副本.您可以看到copy模块的deepcopy方法用于递归复制容器，但是根据我的经验，这不是常见的操作.

The new list is a copy of references. g[0] and a[0] both reference the same object. Thus this is a shallow copy. You can see the copy module's deepcopy method for recursively copying containers, but this isn't a common operation in my experience.

通常，我更喜欢使用更明确的g = list(a)创建列表的副本，但是创建完整切片具有相同的效果.

Stylistically, I prefer the more explicit g = list(a) to create a copy of a list, but creating a full slice has the same effect.

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