深浅Copy 

 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)

 

posted @ 2019-06-14 18:51  WuKongSir  阅读(30)  评论(0)    收藏  举报