深浅拷贝

浅拷贝：

浅拷贝只拷贝一次，浅拷贝只拷贝指针。

import copy
copy.copy()  #浅拷贝
a1 = 123123
a2 = 123123
print(id(a1))  #查看内存地址
print(id(a2))
#22745648
#22745648

a3 = copy.copy(a1)
print(id(a1))
print(id(a3))
#22745648  #内存地址相同
#22745648

深拷贝：

深拷贝拷贝多层，深拷贝可以重新申请空间并将数据复制过来

n1 = {'k1':'wu','k2':123,'k3':['alex',456]}
n2 = n1
print(id(n1))  #39035368
print(id(n2))  #39035368
n3 = copy.copy(n1)
n4 = copy.deepcopy(n1)
print(id(n1))  #39035368
print(id(n3))  #39295376
print(id(n4))  #39035608
print(id(n1['k3']))  #46733552
print(id(n3['k3']))  #46733552
print(id(n4['k3']))  #46731352

dic = {
    "cpu":[80,],
    "mem":[80,],
    "disk":[80,],
}
print('brefore',dic)
new_dic = copy.copy(dic)
new_dic = copy.deepcopy(dic)
new_dic['cpu'][0] = 50
print(dic)
print(new_dic)
#浅拷贝  {'disk': [80], 'mem': [80], 'cpu': [50]}
#        {'disk': [80], 'mem': [80], 'cpu': [50]}
#深拷贝  {'cpu': [80], 'mem': [80], 'disk': [80]}
#        {'cpu': [50], 'mem': [80], 'disk': [80]}