Python表达式结果描述len([1, 2, 3])3list的长度[1, 2, 3] + [4, 5, 6][1, 2, 3, 4, 5, 6]组合[‘Hi~’] * 4[‘Hi~’, ‘Hi~’, ‘Hi~’, ‘Hi~’]重复3 in [1, 2, 3]True元素是否存在于list中for x in [1, 2, 3]: print(x, end=” “)1 2 3遍历list中的元素 ...
list=['Alex','Leigou','Rock',1,2,3] print(list.index('Leigou')) 运行结果: D:\Anaconda3\python.exe D:/PycharmProjects/pythonz/day2/z.py 1 插入(insert) 插入(insert)可以在指定的下标位处插入想要插入的元素,具体实例如下: list=['Alex','Leigou','Rock',1,2,3] list.insert(2,'She...
print(cities+cities2) #合并list #复制 print(cities*3) #复制几次 二、元组Tuple: 元组与list类似,不同之处在于元组的元素不能修改。 Tuple的表现形式:Tuple = () #元组用小括号‘’()‘’标识 Tuple = (1,) #如果元组中只有一个元素,需要在元素后加上 “,” 逗号 Tuple = (a,b,1,2) # 元素...
字段同样可以通过点号来访 问,例如mylist.field。 案例(保存为ds_using_list.py): # This is my shopping listshoplist=['apple','mango','carrot','banana']print('I have',len(shoplist),'items to purchase.')print('These items are:',end=' ')foriteminshoplist:print(item,end=' ')print('\n...
总之,在遇到上述的场景时,列表、元组、集合都不是最合适的选择,此时我们需要字典(dictionary)类型,这种数据类型最适合把相关联的信息组装到一起,可以帮助我们解决 Python 程序中为真实事物建模的问题。 说到字典这个词,大家一定不陌生,读小学的时候,每个人手头基本上都有一本《新华字典》,如下图所示。
C#中元组主要是方便程序员,不用自然可以。比如:当你返回多个值是否还用ref out 或者返回一个list之类的?这些都需要先定义,比较麻烦.元祖在这些场景用的比较多。先说说基本使用: 初始化:var test_tuple = ("萌萌哒", 1, 3, 5, "加息", "加息");//这种方式就是valueTuple了(看vscode监视信息) ...
One method to add a dictionary to a tuple is by using the list addition operation. For this, we will convert a tuple to a list then add append the dictionary at the end of the list and then convert it back to the tuple.# Python program to add a dictionary to tuple # Initializing ...
Python3列表list Python方法append和expend的区别:append直接在list后面加对象,而expend是在list后面添加列的成员,即:list.append(obj),list.expend(list) Python3元组(tuple) tuple 和list非常像似,不同点在于tuple的元素不能更改 Python3字典(Dictionary) d = {key1: value1, key2:value2} print (d {key1...
Python program to add a list to tuple # Python program to add a tuple to list# Creating the ListmyTuple=(9,3,1,4)# Printing the Listprint("Tuple Initially : "+str(myTuple))# Creating TuplemyList=[2,6]# Adding the tuple to listaddList=list(myTuple) ...
The zip() function takes iterables (can be zero or more), aggregates them in a tuple, and returns it. Likewise, dict() gives the dictionary. Example 2: Using list comprehension index = [1, 2, 3] languages = ['python', 'c', 'c++'] dictionary = {k: v for k, v in zip(index...