如何根据对象的属性对对象列表进行排序? [英] How to sort a list of objects based on an attribute of the objects?

问题描述

我有一个Python对象列表，我想按对象本身的属性对其进行排序.列表如下:

I've got a list of Python objects that I'd like to sort by an attribute of the objects themselves. The list looks like:

>>> ut
[<Tag: 128>, <Tag: 2008>, <Tag: <>, <Tag: actionscript>, <Tag: addresses>,
 <Tag: aes>, <Tag: ajax> ...]

每个对象都有一个计数:

Each object has a count:

>>> ut[1].count
1L

我需要按递减计数对列表进行排序.

I need to sort the list by number of counts descending.

我已经看到了几种方法，但是我正在寻找Python的最佳实践.

I've seen several methods for this, but I'm looking for best practice in Python.

推荐答案

# To sort the list in place...
ut.sort(key=lambda x: x.count, reverse=True)

# To return a new list, use the sorted() built-in function...
newlist = sorted(ut, key=lambda x: x.count, reverse=True)

有关按键排序的更多信息.

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