python核心编程笔记1

浅拷贝

person = ['name',['savings',100000.00]]
hubby = person[:]
wifey = list(person)

hubby[0] = 'ljh'
wifey[0] = 'yy'

print hubby,wifey

>>['ljh', ['savings', 100000.0]] ['yy', ['savings', 100000.0]]

hubby[1][1] = 50000.00
print hubby,wifey

>>['ljh', ['savings', 50000.0]] ['yy', ['savings', 50000.0]]

深拷贝

import copy

person = ['name',['savings',100000.00]]
hubby = person
wifey = copy.deepcopy(person)

hubby[0] = 'ljh'
wifey[0] = 'yy'

print hubby,wifey

hubby[1][1] = 50000.00
print hubby,wifey

 

ps:

1、非容器类型（数字、字符串、原子类对象，比如代码、类型和xrange对象等）没有被拷贝这么一说，浅拷贝是用完全切片操作来完成的。

2、如果元组只包含原子类对象，那么对它的深拷贝将不会进行，及时操作使用了深拷贝，也只能得到一个浅拷贝。

import copy

person = ['name',('savings',100000.00)]
newPerson = copy.deepcopy(person)
[id(x) for x in person,newPerson]
[id(x) for x in person]
[id(x) for x in newPerson]