按字母顺序对元组字符串进行排序，并按字母顺序对字符串元组进行反向排序' [英] Sorting a tuple of strings alphabetically and reverse alaphabetically'

问题描述

让我们说您有一个元组列表(last_name，first_name)，并且想要按last_name的字母顺序对它们进行排序，然后，如果两个人具有相同的名称，则按照名字的字母顺序对其进行排序.有没有办法用一行来做到这一点?

Lets say you have a list of tuples (last_name, first_name) and you want to sort them reverse alphabetically by last_name and then if two people have the same name for them to be sorted alphabetically by first name. Is there a way to do this with one line?

例如

Sorted(names, key = ?) = [('Zane', 'Albert'), ('Zane', 'Bart'), ('Python', 'Alex'), ('Python', 'Monty')]

用两行代码，我想您可以依靠排序稳定性，并首先按名字排序，然后按相反的姓氏排序.

With two lines I guess you could rely on sort stability and first sort by first name and then sort by last name reversed.

推荐答案

这是一个itertools.groupby解决方案:

from itertools import groupby
from operator import itemgetter

li = [('x', 'y'), ('s', 'e'), ('s', 'a'), ('x', 'z')]

[p for k, g in groupby(sorted(li, reverse=True), itemgetter(0)) for p in reversed(list(g))]
# [('x', 'y'), ('x', 'z'), ('s', 'a'), ('s', 'e')]
 

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