python - 使用键和语言环境对列表列表进行排序(此处为 : german umlauts)

Question

我知道如何使用(简单的)key=function 自定义排序。但是，如果我需要更复杂的 key= 函数，该怎么做。我在整理它时遇到了问题。

这是片段:在第一个示例中，我使用 key=locale.strxfrm，这足以满足此目的。第二个例子我使用了另一个key=函数(itemgetter)。但我同时需要两者。

import locale
import operator

locale.setlocale(locale.LC_ALL, "")
# on my computer: German_Germany.1252

lastnames = ["Bange", "Änger", "Amman", "Änger", "Zelch", "Ösbach"]
print(sorted(lastnames, key=locale.strxfrm)) # sorted correct
                                             # alphabetically for Germany
print()

lastnames_firstnames_groups =[
    ["Bange", "Michael", 2],
    ["Änger", "Ämma", 2],
    ["Amman", "Anton", 1],
    ["Änger", "Chris", 2],
    ["Zelch", "Sven", 1],
    ["Ösbach", "Carl", 1]
]
print(sorted(lastnames_firstnames_groups, key=operator.itemgetter(2,0,1)))
# The result is sorted as I expected (the german umlaute are NOT sorted
# the correct way). Is there a way to "add" the string tranformation strxfrm
# as in the first example to this. 

有什么提示吗？

Answer 1

听起来你可能想要

print(
    sorted(
        lastnames_firstnames_groups,
        key=lambda t: (t[2], strxfrm(t[0]), strxfrm(t[1]))
    )
)