在Python中按元素值对元组进行排序 [英] Sorting tuples by element value in Python

问题描述

我需要按特定的tuple元素对Python中的元组列表进行排序，假设它是本例中的第二个元素.我尝试过

I need to sort a list of tuples in Python by a specific tuple element, let's say it's the second element in this case. I tried

sorted(tupList, key = lambda tup: tup[1])

我也尝试过

sorted(tupList, key = itemgetter(1))
'''i imported itemgetter, attrgetter, methodcaller from operator'''

，但是两次都返回了相同的列表.我检查了

but the list was returned the same both times. I checked

使用自定义键在python中对元组进行排序

在python列表中对元组进行排序

https://wiki.python.org/moin/HowTo/Sorting

推荐答案

我猜您正在调用 sorted ，但未将结果分配到任何地方.像这样:

I'm guessing you're calling sorted but not assigning the result anywhere. Something like:

tupList = [(2,16), (4, 42), (3, 23)]
sorted(tupList, key = lambda tup: tup[1])
print(tupList)

sorted 创建一个新的排序列表，而不是修改原始列表.试试:

sorted creates a new sorted list, rather than modifying the original one. Try:

tupList = [(2,16), (4, 42), (3, 23)]
tupList = sorted(tupList, key = lambda tup: tup[1])
print(tupList)

或者:

tupList = [(2,16), (4, 42), (3, 23)]
tupList.sort(key = lambda tup: tup[1])
print(tupList)

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