Python深浅copy
2021-07-14 19:06
标签：赋值 hid lex span deepcopy app import hide div 1.其他代码 Python深浅copy 标签：赋值 hid lex span deepcopy app import hide div 原文地址：https://www.cnblogs.com/whylinux/p/9537738.html
1 l1 = [1, 2, 3]
2 l2 = l1
3 l1.append(‘a‘)
4 print(l1, l2) # 深cpoy
5
6 l1 = [1, 2, 3]
7 l2 = l1.copy() # 浅拷贝
8 l2.append(‘a‘)
9 print(l1, l2)
1 # 赋值运算
2 # l1 = [1,2,3]
3 # l2 = l1
4 # l1.append(‘a‘)
5 # print(l1,l2)
6
7 #copy
8 # l1 = [1,2,3]
9 # l2 = l1.copy()
10 # print(l1,l2)
11 # print(id(l1),id(l2))
12 # l2.append(‘a‘)
13 # print(l1,l2)
14
15 # l1 = [1,2,[4,5,6],3]
16 # l2 = l1.copy()
17
18 # print(l1,id(l1))
19 # print(l2,id(l2))
20 # l1.append(‘a‘)
21 # print(l1,l2)
22 # l1[2].append(‘a‘)
23 # print(l1,l2)
24 # print(id(l1[2]))
25 # print(id(l2[2]))
26 import copy
27 # l1 = [1,2,[4,5,6],3]
28 # l2 = copy.deepcopy(l1)
29 # print(l1,id(l1))
30 # print(l2,id(l2))
31 # l1[2].append(‘a‘)
32 # print(l1,l2)
33
34 # l1 = [1,[1],2,3,4]
35 # l2 = l1[:]
36 # l1[1].append(‘a‘)
37 #l2 的结果是什么?
38
39
40 # print(l1,id(l1))
41 # print(l2,id(l2))
42 # print(l1[1] is l2[1])
43
44 # li = [‘alex‘,‘taibai‘,‘wusir‘,‘egon‘]
45 # for i in li:
46 # print(li.index(i),i)
47
48 # for index,i in enumerate(li,1):
49 # print(index,i)