Python learns lesson five! List

List lists

# list classes, lists
#中括号括起来
#, separating each element
#列表中的元素可以是数字, String, List, Boolean ... All of them can be put in.
Put anything inside #就是个 "collection"
#索引取值
#切片结果也是列表

Li = [ Zhang Mingshing ,'star', [' 19,3],' jiege  '# objects created from the list class print(li[0])print(li[3:-1]) # for Loop, while Loop  for inch Li:     Print (item)

Modify

Li = [A.'Star',['Zhang Mingshing', [19,3],'Jiege'],true]li[0]= 10Print(LI) li[1] = [11,22,22]Print(LI)#How to modify slicesLi[1:3] = [22,33]Print(LI) [10, 2, 3,'Star', ['Zhang Mingshing', [19, 3],'Jiege'], true][10, [11, 22, 22], 3,'Star', ['Zhang Mingshing', [19, 3],'Jiege'], true][10, 22, 33,'Star', ['Zhang Mingshing', [19, 3],'Jiege'], True]

Delete

#Delete, the first wayLi = [A.'Star',['Zhang Mingshing', [19,3],'Jiege'],true]delLi[1]Print(LI)#Slice the way to deletedelLi[1:3]Print(LI) [1, 3,'Star', ['Zhang Mingshing', [19, 3],'Jiege'], true][1, ['Zhang Mingshing', [19, 3],'Jiege'], True]

Operation

# the value of the list of neutrons  ' Star ', [' Zhang Mingshing ' jiege 'print (li[4][1][0])19

#Convert a string to a list#conversion, string conversion to List Li = Lists (' dfdsafsfdasf ') internal use for loop, number cannot be used for loops ='ADFSAFDFASDFDSFASDFDSFF'New_li=list (s)Print(new_li) ['a','D','F','s','a','F','D','F','a','s','D','F','D','s','F','a','s','D','F','D','s','F','F']

 #   Converts the list to a string, If the list has both a number and a string, you can write it yourself for loop   li  = [11,22,33,  " 123  , "  star   " ]s  =  " for  i in   li:s  = s + STR (i)  print   (s) 112233123star 

# converts a list to a string, and the elements in the list can be used only with a string join  Li = ['123','star''. Join (LI)  Print(v) 123star

APPEND () original value last appended

Li = [11,22,33,44]li.append (5)print(LI) [11, 22, 33, 44, 5]

Clear () Clear

Li = [11,22,33,44]li.clear ()print(LI)

Copy () copies, shallow copy

Li = [11,22,33,44= li.copy ()print(v)

Count ()

# number of occurrences of the calculated element li =[11,22,33,44,22 = Li.count ()print(v)

2

Extend () Extending the original list, parameters: objects that can be iterated

Li = [11,22,33,44]li.append ([9898,'incredibly'])#append an element as a whole to the lastLi.extend ([9898,'incredibly'])#equivalent to looping one element to the lastLi.extend ('incredibly')Print(LI) [11, 22, 33, 44, [9898,'incredibly'], 9898,'incredibly','No','Get','the']

Index () Gets the current value indexed position by value (left priority)

Li = [11,22,33,44= Li.index ()print(v)

1

Insert () Adds an element at the specified index position

Li = [11,22,33,44]li.insert (1,99)print(LI) [11, 99, 22, 33, 44]

Pop () deletes a value and can get the deleted value without specifying the index to delete the last value by default

Li = [11,22,33,44= li.pop (1)print(li)print(v) [one,  ]22

Remove () removes the specified value from the list, with the left priority removed

Li = [11,22,33,44]li.remove (P)print(LI)    

Several ways to delete a list ps:pop (), remove (), Del li[0] index, del[0:3] slice, clear ()

REverse () reverses the current list

Li = [11,22,33,44]li.reverse ()print(LI)

[44, 33, 22, 11]

Sort () Sorting of list

Li = [11,55,22,33,44]#li.sort () #从小到大排序li.sort (reverse=true)# from big to small rows Print (LI) [55, 44, 33, 22, 11]

PS: After creating a string, you can use the index value, you can not modify the value, the list can modify the value

Python learns lesson five! List