列出Python中的唯一对象 [英] Make List of Unique Objects in Python

问题描述

可以像这样填充" Python中的数组:

It is possible to 'fill' an array in Python like so:

> [0] * 10
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

我想使用此示例原理来快速创建类似对象的列表:

I wanted to use this sample principle to quickly create a list of similar objects:

> a = [{'key': 'value'}] * 3
> a
[{'key': 'value'}, {'key': 'value'}, {'key': 'value'}]

但是看来这些对象是相互链接的:

But it appears these objects are linked with one another:

> a[0]['key'] = 'another value'
> a
[{'key': 'another value'}, {'key': 'another value'}, {'key': 'another value'}]

鉴于Python没有clone()方法(这是我寻找的第一件事)，我如何创建唯一对象而无需声明for循环并调用append()添加它们吗?

Given that Python does not have a clone() method (it was the first thing I looked for), how would I create unique objects without the need of declaring a for loop and calling append() to add them?

谢谢！

推荐答案

简单的列表理解应该可以解决问题:

A simple list comprehension should do the trick:

>>> a = [{'key': 'value'} for _ in range(3)]
>>> a
[{'key': 'value'}, {'key': 'value'}, {'key': 'value'}]
>>> a[0]['key'] = 'poop'
>>> a
[{'key': 'poop'}, {'key': 'value'}, {'key': 'value'}]

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