Python list depth copy and related actions

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, does not affect

Import Copy
Names2 = copy.deepcopy (names)
Print (names)
Print (Names2)
NAMES[2] = "Xiang Touch"
Names[3][0] = "ALEC"
Print (names)
Print (Names2)

3, tuples: Can not edit the list, other actions the same list

Names = (' Alex ', ' Jack ')

4. List operation

#列表类型
names = ["Zhangyang", "Guyun", "Xiangpeng", ["Alex", "Jack"], "Xulianghen"]
Names2 = ["1", "2", "3", "4"]
Print (names)
#print (Names[0])  #第一个位置
#print (Names[0],names[2])
#print (Names[1:3])  #切片, Gu Tou regardless of the tail
#print (names[1:])   #取从1到结束位置
#print (Names[-1])    #取最后一个
#print (Names[-2:-1])  #不包含最后一个值, Gu Tou regardless of the tail
#print (Names[:3])  #0可以忽略

#names. Append ("Leihaidong")  #插入到最后面
#names. Insert (1, "Chenronghua")  #插入到固定位置, you can insert only one

#names [2] =  "Xiedi"  #修改

#删除
#names. Remove ("Zhangyang")
#del Names[1]
#names. Pop (1)  #不输入默认删除最后一个

#print (Names.index ("Guyun"))  #找Guyun的下标
#print (  names[names.index ("Guyun"))
#统计Guyun个数
#print (Names.count ("Guyun"))
#names. Clear () #清空
#names. Reverse () #反转
#names. Sort ()  #排序
#names. Extend (names2) #扩展
#del Names2  #删除变量

Python list depth copy and related actions