仔细思考,sort_by_first_element(lst):中的lst其实是形参,另外,可以发现一定是sort函数内部实现了排序,其根据给定原始列表信息lst及函数sort_by_first_element返回值是能实现排序结果的,也就是说想要返回元素的第一个元素,那么sort_by_first_element(lst)中的lst可能传入参数时像这样:sort_by_first_element(lst[0...
# take the second element for sortdeftake_second(elem):returnelem[1]# random listrandom = [(2,2), (3,4), (4,1), (1,3)]# sort list with key sorted_list = sorted(random, key=take_second) # print listprint('Sorted list:', sorted_list) 运行代码 输出 排序列表:[(4, 1), (2...
(9,0)]sorted_tuples=sorted(tuples)# Example 3: Sort the list of tuples by first element descendingtuples=[(2500,'Hadoop'),(2200,'Spark'),(3000,'Python')]tuples.sort(key=lambdax:x[0],reverse=True)# Example 4: Sorted the list of tuples by first element descendingtuples=[(2500,...
>>> print(list_num3) [0, 1, 2, 3, 4, 0, 1] 七、 排序 ls.sort([[key=None,]reverse=False]):ls是待排序列表,key接受一个函数,通过该函数获取用于排序时比较大小的数据,reverse指定升序还是降序排列(False默认升序,True降序)。 >>> ls=list(range(9)) >>> ls.sort() >>> print(ls) [0...
Updated on February 24, 2021 by Arpit Mandliya In this tutorial, we will see about how to sort list of tuples on the basis of various criterion. Let’s understand with the help of example Let’s say you have list of tuples as below: 1 2 3 4 #tuple having structure (name,age,...
To effectively sort nested tuples, you can provide a custom sorting key using the key argument in the sorted() function.Here’s an example of sorting a list of tuples in ascending order by the second element in each tuple: my_list = [(1, 4), (3, 1), (2, 5)] sorted_list = ...
Python will return an error if you attempt to use sorted() on a list containing non-comparable data. In the example below, you have None and the integer zero (0) in the same list. Python doesn’t know how to sort these two types because of their incompatibility: ...
## Say we have a list of strings we want to sort by the last letter of the string.strs=['xc','zb','yd','wa']## Write a little function that takes a string, and returns its last letter.## This will be the key function (takes in 1 value, returns 1 value).defMyFn(s):ret...
蓝桥杯python青少组第十三届国赛试题 一、单选题（每题4分，共20分）1.运行以下代码，输出结果是（）。python a = [1, 2, 3, 4, 5]b = a[::1]a[0] = 10 print(b)A. [1, 2, 3, 4, 5] B. [5, 4, 3, 2, 1] C. [10, 2, 3, 4, 5] D. [5, 4, 3, 10, 1]答案：B ...
· sorted()和sort()函数用于对列表的值进行排序。sorted()具有返回类型,而sort()修改原始列表。 #Other functions for listnum_list = [1, 2, 3, 10, 20, 10]print(len(num_list)) #find length of listprint(num_list.index(10)) #find index of element that occurs firstprint(num_list.count(10...