浅copy 与 深copy

Posted 2020-09-23

 1 import copy
 2 names = ["zhangyang", ‘guyun‘, ‘xiangpeng‘, [‘jack‘,‘tom‘], ‘xuliangchen‘]
 3 names2 = names.copy() #浅copy,复制后改变原列表，copy后的列表不发生改变
 4 
 5 
 6 names[2] = "祥鹏"
 7 names.append("zhangshan")
 8 
 9 print(names)
10 print(names2)
11 
12 names3 = copy.deepcopy(names)#深copy，copy后原列表改变，copy的列表也会发生同样改变
13 print(‘this is names3:‘, names3)

 浅copy的三种实现方式：

 1 import copy
 2 
 3 names = ["zhangyang", ‘guyun‘, ‘xiangpeng‘, [‘jack‘,‘tom‘], ‘xuliangchen‘]
 4 
 5 #第一种方式
 6 names2 = copy.copy(names)
 7 #第二种
 8 names3 = names[:]
 9 #第三种
10 names4 = list(names)

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