mylist.sort(key=sort_by_first_element)#对第一个元素进行排序print("排序后"':',end='')print(mylist)#调用__str__()mylist2= MyList([[1, 1, 0], [2, 0], [1, 2], [1, 1], [2, 0, 3]])#或者传入lambda匿名函数mylist2.sort(key=lambdae:e[1])#对第二个元素进行排序,相当于...
示例3:使用具有键功能的 sorted() 对列表进行排序 # 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...
fromoperatorimportitemgetter# (first name, last name, score) tuplesgrade=[('Freddy','Frank',3),('Anil','Frank',100),('Anil','Wang',24)]sorted(grade,key=itemgetter(1,0))# [('Anil', 'Frank', 100), ('Freddy', 'Frank', 3), ('Anil', 'Wang', 24)]sorted(grade,key=itemgetter...
3 tuple 元组 元组是不可变序列,没有增、删、改操作 元组中的元素时可重复的 3.1 创建元组对象 # 方法一 t1 = ('a', 'b', 'c') # t1 = 'a', 'b', 'c' # 可省略小括号 print('t1\'s value:', t1) # t1's value: ('a', 'b', 'c') print('t1\'s id :', id(t1)) # t1...
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 = ...
当然也可以利用tuple()来把列表生成元组。 #利用列表推导式快速生成列表 >>> ls3=[i for i in range(4)] >>> print(ls3) [0, 1, 2, 3] 三、 增 1、指定位置插入元素 ls.insert(index,x):将元素x插入ls列表下标为index的位置上。 >>> ls3=[1,1.0,print(1),True,['list',1],(1,2),{1...
1299 Replace Elements with Greatest Element on Right Side C++ Python O(n) O(1) Easy 1304 Find N Unique Integers Sum up to Zero C++ Python O(n) O(1) Easy 1313 Decompress Run-Length Encoded List C++ Python O(n) O(1) Easy 1329 Sort the Matrix Diagonally C++ Python O(m * n ...
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 ...
#Appending elementsmy_tuple = (1, 2, 3)my_tuple = my_tuple + (4, 5, 6) #add elementsprint(my_tuple)Output: (1, 2, 3, 4, 5, 6) 元组赋值: 元组打包和解包操作很有用,执行这些操作可以在一行中将另一个元组的元素赋值给当前元组。元组打包就是通过添加单个值来创建元组,元组拆包则是将元...
importoperatorx={1:2,3:4,4:3,2:1,0:0}# sort on values sorted_x=sorted(x.items(),key=operator.itemgetter(1)) result [(0,0),(2,1),(1,2),(4,3),(3,4)] sorted_x will be a list of tuples sorted by the second element in each tuple. dict(sorted_x) == x. ...