浅copy与深copy举例

 例1： 

 1 #!/usr/bin/env python
 2 import copy
 3 d1 = {'x':1,'y':2,'z':[3,4.5]}
 4 d2 = d1
 5 d3 = d1.copy()
 6 d4 = copy.copy(d1)
 7 d5 = copy.deepcopy(d1)
 8 d1['x'] = 'm'
 9 d1['z'][0] = 9
10 print(d1)
11 print(d2)
12 print(d3)
13 print(d4)
14 print(d5)

  输出结果：

 例2：

 1 #!/usr/bin/env python
 2 import copy
 3 l1 = [1,2,[3.4,5]]
 4 l2 = l1[:]
 5 l3 = l1
 6 l4 = copy.copy(l1)
 7 l5 = copy.deepcopy(l1)
 8 l1[0] = 'a'
 9 l1[2][0] = 3
10 print(l1)
11 print(l2)
12 print(l3)
13 print(l4)
14 print(l5)

 输出结果：

posted @ 2018-05-27 23:25  头发乱刘  阅读(280)  评论(0)  编辑  收藏  举报