python中的深copy和浅copy

最新推荐文章于 2023-06-13 16:20:11 发布

转载最新推荐文章于 2023-06-13 16:20:11 发布 · 82 阅读

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原文链接：http://blog.51cto.com/406647516/2139809

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#python

深浅copy类似于linux的硬软链接，一个复制为另一个文件，一个类似于快捷方式。

import copy

#这里有子对象
numbers=['1','2','3',['4','5']]
#浅copy
num1=copy.copy(numbers)
#深copy
num2=copy.deepcopy(numbers)

#直接对对象内容进行修改
num1.append('6')

#这里可以看到内容地址发生了偏移，增加了偏移‘6’的地址
print('numbers:',numbers)
print('numbers memory address:',id(numbers))
print('numbers[3] memory address',id(numbers[3]))
print('num1:',num1)
print('num1 memory address:',id(num1))
print('num1[3] memory address',id(num1[3]))

num1[3].append('6')

print('numbers:',numbers)
print('num1:',num1)
print('num2',num2)

输出：
numbers: ['1', '2', '3', ['4', '5']]
numbers memory address: 1556526434888
numbers memory address 1556526434952
num1: ['1', '2', '3', ['4', '5'], '6']
num1 memory address: 1556526454728
num1[3] memory address 1556526434952
numbers: ['1', '2', '3', ['4', '5', '6']]
num1: ['1', '2', '3', ['4', '5', '6'], '6']
num2 ['1', '2', '3', ['4', '5']]

转载于:https://blog.51cto.com/406647516/2139809