Python list depth copy and related operations

1. Shallow COPY, if the source changes, p1[1][1], p2[1][1], person[1][1] will change together

import copy 
person = ['name',['saving',100]] 
''' 
p1 = copy.copy(person) 
p2 = person[:] 
p3 = list(person) 
''' 
p1 = person[:] 
p2 = person[:] 
print(p1) 
print(p2) 

p1[0] = 'alex' 
p2[0] = 'fengjie' 
print(p1) 
print(p2) 

p1[1][1] = '50' 
print( p1) 
print(p2) 

1. Deep copy: source changes, do not affect

import copy 
names2 = copy.deepcopy(names) 
print(names) 
print(names2) 
names[2] = "Xianpeng" 
names[3][0] = "ALEC" 
print(names) 
print(names2) 

3. Tuple : The list that cannot be edited, other operations are the same as the list

names = ('alex', 'jack') 

4. List operations

#List type 
names = ["Zhangyang","Guyun","Xiangpeng",["alex","jack"],"xulianghen"] 
names2 = ["1","2","3","4" ] 
print(names) 
#print(names[0]) #The first position# 
print(names[0],names[2]) 
#print(names[1:3]) 
#Slice , regardless of the head and tail#print (names[1:]) #take from 1 to the end position 
#print(names[-1]) #take the last 
#print(names[-2:-1]) #does not include the last value, regardless of the head and tail 
#print(names[:3]) #0 can be ignored 

#names.append("Leihaidong") #Insert to the end 
#names.insert(1,"Chenronghua") #Insert to a fixed position, only one can be inserted at a time 

# names[2] = "Xiedi" #Modify 

#Delete 
#names.remove("Zhangyang") 
#del names[1] 
#names.pop(1) #Delete the last one by default without input 

#print(names.index("Guyun")) #Find Guyun's subscript 
#print( names[names.index("Guyun")]) 
#Count the number of Guyun
#print(names.count("Guyun")) 
#names.clear() 
#clear #names.reverse() #reverse 
#names.sort() #sort 
#names.extend(names2) 
#extend #del names2 # delete variable