python中的浅拷贝与深拷贝

浅拷贝可以拿丈夫与媳妇公用一张银行卡来举例  
# python
>>> husband = ['liang',123,[10000,6000]]   #丈夫的银行卡信息（姓名，id,额度，余额）
>>> wife = husband.copy()          #媳妇和丈夫公用一张银行卡（姓名与id不同，但是额度与余额相同）
>>> wife[0] = 'yue'
>>> wife[1] = 456
>>> wife[2][1] -= 3000             #媳妇花费3000
>>> wife
['yue', 456, [10000, 3000]]         #显示媳妇余额
>>> husband
['liang', 123, [10000, 3000]]        #显示丈夫余额

引入了小三，小三花费的钱媳妇不知道：

>>> liang = ['xin',111,[15000,10000]]
>>> yue = liang.copy()
>>> yue
['xin', 111, [15000, 10000]]
>>> yue[0] = 'mumu'
>>> yue[1] = 222
>>> yue[2][1] -= 5000
>>> yue
['mumu', 222, [15000, 5000]]
>>> liang
['xin', 111, [15000, 5000]]
以上是浅拷贝；

以下是深拷贝：
>>> import copy
>>> xiaosan = copy.deepcopy(liang)
>>> xiaosan[0] ="**"
>>> xiaosan[1] = 333
>>> xiaosan[2][1] -= 1999
>>> xiaosan
['**', 333, [15000, 3001]]            #已经减少啦
>>> liang
['xin', 111, [15000, 5000]]
>>> yue
['mumu', 222, [15000, 5000]]       #媳妇不知道