浅copy与深copy举例

Posted 2020-11-09 头发乱刘

 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：