如何在Python 3中使用自定义比较功能? [英] How to use a custom comparison function in Python 3?

问题描述

在 Python 2.x 中，我可以将自定义函数传递给sort和.sort函数

In Python 2.x, I could pass custom function to sorted and .sort functions

>>> x=['kar','htar','har','ar']
>>>
>>> sorted(x)
['ar', 'har', 'htar', 'kar']
>>> 
>>> sorted(x,cmp=customsort)
['kar', 'htar', 'har', 'ar']

因为，在我的语言中，辅音是随此顺序提供的

Because, in My language, consonents are comes with this order

"k","kh",....,"ht",..."h",...,"a"

但是在 Python 3.x 中，看起来我无法传递cmp关键字

But In Python 3.x, looks like I could not pass cmp keyword

>>> sorted(x,cmp=customsort)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'cmp' is an invalid keyword argument for this function

还有其他选择吗?还是我应该编写自己的排序函数?

Is there any alternatives or should I write my own sorted function too?

_{注意:我通过使用"k"，"kh"等进行了简化.实际字符是Unicode，甚至更复杂，有时在辅音前后都有元音，所以我完成了自定义比较功能，因此那部分还可以.唯一的问题是我无法将自定义比较功能传递给sort或.sort}

推荐答案

使用key参数(并遵循

Use the key argument (and follow the recipe on how to convert your old cmp function to a key function).

functools具有 docs.python中提到的函数cmp_to_key. .org/3.6/library/functools.html#functools.cmp_to_key

functools has a function cmp_to_key mentioned at docs.python.org/3.6/library/functools.html#functools.cmp_to_key

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