Python Learning DAY2 data structure

Lists [List]:

Lists are the most basic data structures in Python, and each element in the list is assigned a location

Lists are also known as arrays, and arrays can be divided into one-dimensional arrays, multidimensional arrays

#one-dimensional arraysList = ['Denny','Jenny','liming','Lilei','Hanmeimei']#Multidimensional Arrays #two-dimensional arrayslist1=[1,2,3,4,[51,52,53,54],6,,78] #three-dimensional arraysList2=[1,2,3,4,[xiaoming[18,175],xiaola#columnlist = [' Chihuahua 1',' Chihuahua 2',' Chihuahua 3' ,' Chihuahua 4'] 

A1=LIST[0]A2= List[1]a3= List[2]a4= List[3]#press Subscript to mark the valuePrint('a No. 0 element:', A1)Print('a 1th element:', A2)Print('a 2nd element:', A3)Print('a 3rd element:', A4) Run result: D:\Python\Miniconda3\python.exeNo. 0 Element: Chihuahua 1 1th element: Chihuahua 2 2nd element: Chihuahua 3 3rd element: Chihuahua 4Process finished with exit code 0

　

List of basic operations: Add, delete, change, check

Increase:

1 #Increase2 Way One:3List = ['Denny','Jenny','Lilei','Hanmeimei']4 #Append add elements to the last position by default5List.append ('liming')6 Print(list)7 8 Operation Result:9D:\Python\Miniconda3\python.exeTen['Denny','Jenny','Lilei','Hanmeimei','liming'] One Process finished with exit code 0 A  -  - Way Two: theList = ['Denny','Jenny','Lilei','Hanmeimei'] - #fill in the subscript in the specified position -List.insert (2,'liming') - Print(list) +  - Operation Result: +D:\Python\Miniconda3\python.exe A['Denny','Jenny','liming','Lilei','Hanmeimei'] atProcess finished with exit code 0

By deleting

#DeleteWay One:#deletes the element at the specified positionList = ['Denny','Jenny','liming','Lilei','Hanmeimei']delList[3]Print(list) Run Result: D:\Python\Miniconda3\python.exe['Denny','Jenny','liming','Hanmeimei']process finished with exit code 0 mode two: List= ['Denny','Jenny','liming','Lilei','Hanmeimei']#Pop does not write to the specified location by default delete the last elementList.pop ()Print(list) Run Result: D:\Python\Miniconda3\python.exe['Denny','Jenny','liming','Lilei']process finished with exit code 0 way three: list= ['Denny','Jenny','liming','Lilei','Hanmeimei']#Pop can also delete an element at a specified locationList.pop (1)Print(list) Run Result: D:\Python\Miniconda3\python.exe['Denny','liming','Lilei','Hanmeimei']process finished with exit code 0 mode four: List= ['Denny','Jenny','liming','Lilei','Hanmeimei']#Remove Deletes the specified elementList.remove ('Jenny')Print(list) Run Result: D:\Python\Miniconda3\python.exe['Denny','liming','Lilei','Hanmeimei']process finished with exit code 0 mode five: List= ['Denny','Jenny','liming','Lilei','Hanmeimei']#Clear Listlist.clear ()Print(list) Run Result: D:\Python\Miniconda3\python.exe[]process finished with exit code 0

Change

#ChangeList = ['Denny','Jenny','liming','Lilei','Hanmeimei']list[1] ='xiaoming'Print(list) Run Result: D:\Python\Miniconda3\python.exe['Denny','xiaoming','liming','Lilei','Hanmeimei']process finished with exit code 0

Check

List = ['Denny','Jenny','liming','Lilei','Hanmeimei']#query according to subscriptA = List[1]#-1 Take the last elementb = list[-1]Print(a)Print(b) Result of operation: D:\Python\Miniconda3\python.exe Jennyhanmeimeiprocess finished with exit code 0

Python Learning DAY2 data structure