pickle使用及案例

一、字典格式数据源写入数据库文件

#！/usr/bin/env python
# -*- coding:utf-8 -*-
import pickle
accounts ={1000:'alex',
           'name':'xxx',
           'email':'xxxxsss@163.com',
           'password':'abc123',
           'balance':100000,
        'phone':13643424246,
           'bank_acc':{'icbc':132435,'abc':557868687,'bac':787977564}}

print(pickle.dumps(accounts))
f=open('account.db','wb')
f.write(pickle.dumps(accounts))
f.close()

二、打开文件，修改文件，关闭文件

import pickle
accFile = open('account.db','rb')
accDict = pickle.loads(accFile.read())
accFile.close()
accDict['balance']-=500


f=open('account.db','wb')
f.write(pickle.dumps(accDict))
f.close()
print(accDict)

三、打开文件最后核查

import pickle
f = open('account.db','rb')
account_db = pickle.loads(f.read())
f.close()
print(account_db)