python基础之浅复制与深复制

Posted 2020-10-04

关于列表、字典、元组的浅复制和深复制，数字和字符串没有浅复制和深复制一说。下面我直接用代码来体现：

 1 import copy
 2 
 3 names = [‘Cahill‘,‘Teenglan‘,‘Eric‘,‘Peggie‘,‘Aalto‘,‘Baal‘,‘Sadie‘,
 4          ‘Gage‘,‘Hagan‘,‘Jack‘,‘Kaley‘,‘Mabel‘,‘Lacy‘,‘Nadine‘,‘Pace‘,‘Amy‘]
 5 
 6 #浅复制
 7 names2 = names.copy()
 8 names2[1] = "修改了"
 9 print(names)
10 #[‘Cahill‘, ‘Teenglan‘, ‘Eric‘, ‘Peggie‘, ‘Aalto‘, ‘Baal‘, ‘Sadie‘,
11 #  ‘Gage‘, ‘Hagan‘, ‘Jack‘, ‘Kaley‘, ‘Mabel‘, ‘Lacy‘, ‘Nadine‘, ‘Pace‘, ‘Amy‘]
12 print(names2)
13 #[‘Cahill‘, ‘修改了‘, ‘Eric‘, ‘Peggie‘, ‘Aalto‘, ‘Baal‘, ‘Sadie‘,
14 # ‘Gage‘, ‘Hagan‘, ‘Jack‘, ‘Kaley‘, ‘Mabel‘, ‘Lacy‘, ‘Nadine‘, ‘Pace‘, ‘Amy‘]
15 print("")
16 
17 
18 print("----------------修改第一层-----------------------------")
19 names3 = [‘Cahill‘,‘Peggie‘,[‘Ursula‘,‘Val‘,[‘Zena‘,‘Babb‘,‘Eric‘],‘Teenglan‘,],‘Amy‘]
20 names4 = names3.copy()
21 names3[1] = "修改第一层"
22 print(names3)
23 #[‘Cahill‘, ‘修改第一层‘, [‘Ursula‘, ‘Val‘, [‘Zena‘, ‘Babb‘, ‘Eric‘], ‘Teenglan‘], ‘Amy‘]
24 print(names4)
25 #[‘Cahill‘, ‘Peggie‘, [‘Ursula‘, ‘Val‘, [‘Zena‘, ‘Babb‘, ‘Eric‘], ‘Teenglan‘], ‘Amy‘]
26 
27 
28 print("")
29 print("-----------------修改第二层-------------------------------")
30 names3[2][1] = "修改第二层"
31 print(names3)
32 #[‘Cahill‘, ‘修改第一层‘, [‘Ursula‘, ‘修改第二层‘, [‘Zena‘, ‘Babb‘, ‘Eric‘], ‘Teenglan‘], ‘Amy‘]
33 print(names4)
34 #[‘Cahill‘, ‘Peggie‘, [‘Ursula‘, ‘修改第二层‘, [‘Zena‘, ‘Babb‘, ‘Eric‘], ‘Teenglan‘], ‘Amy‘]
35 
36 
37 print("")
38 print("----------------------修改第三层-----------------------------------")
39 names3[2][2][0] = "修改第三层"
40 print(names3)
41 print(names4)
42 #浅复制只复制了第一层，从第二层开始只复制其快捷方式（即改动原文件，复制的跟着改动）。
43 
44 
45 print("")
46 print("------------------------------深复制------------------------------")
47 namett = [‘Cahill‘,‘Peggie‘,[‘Ursula‘,‘Val‘,[‘Zena‘,‘Babb‘,‘Eric‘],‘Teenglan‘,],‘Amy‘]
48 namett2 = copy.deepcopy(namett)
49 
50 print("")
51 print("--------------------------------复制第1层------------------------------------")
52 namett[0] = "复制第1层"
53 print(namett)
54 print(namett2)
55 
56 print("")
57 print("--------------------------------复制第2层------------------------------------")
58 namett[2][0] = "复制第2层"
59 print(namett)
60 print(namett2)
61 
62 
63 print("")
64 print("--------------------------------复制第3层------------------------------------")
65 namett[2][2][0] = "复制第3层"
66 print(namett)
67 print(namett2)
68 #深复制：完全的多层复制