Python 深浅copy

Posted 2020-06-13

#!/usr/bin/env python3
import copy

#copy 有两种
#浅copy
#copy.copy()

#深copy
#copy.deepcopy()

‘‘‘
########################
#                      #
#   字符串于数字的copy   #
#                      #
########################


#内存地址相同,字符串于数字的copy永远都是用的内存中的唯一的地址
#a = 123123
#b = 123123
#print(id(a))
#print(id(b))

#a1 = 123123
#b1 = copy.copy(a1)
#print(id(b1))

a2 = 123123
b2 = copy.deepcopy(a2)
print(id(a2))
‘‘‘

#其他，元组、列表、字典的copy

dic = {‘name‘:‘andy‘,‘age‘:18,‘job‘:‘IT‘,‘pro‘:[1,2,3,4,5]}
#浅copy
dic2 = copy.copy(dic)
print(dic)
print(id(dic))
print(dic2)
print(id(dic2))

#深copy
dic2 = copy.deepcopy(dic)
print(dic)
print(id(dic))
print(dic2)
print(id(dic2))


#实例，网络模版
#假设如下是网络模版，有很多机器都要使用，重复创建太傻了，所以就用到了copy


#浅copy会出错，把不需要修改数据已经修改了，会连同模版一起修改掉
ds = {
    ‘cup‘:[80,],
    ‘mem‘:[80,],
    ‘disk‘:[80,]
}
#print(‘浅copy‘)
# print(ds)
# new_ds = copy.copy(ds)
# new_ds[‘cup‘][0] = 50
# print(new_ds)
# print(ds)


#深copy只修改需要的数据，不会对模版造成影响
print(‘深copy‘)
print(ds)
new_ds = copy.deepcopy(ds)
new_ds[‘cup‘][0] = 50
print(new_ds)
print(ds)