功能要求：

  • 额度15000

  • 可以提现，手续费5%

  • 记录消费流水

  • 支持每月账单查询

  • 提供还款接口

调用的相关模块：

import time    #time模块，提供各种操作时间的函数
time.strftime("%Y-%m-%d %X", time.localtime())
'2015-12-15 23:35:26'
import getpass    #getpass 模块 -> 命令行下输入密码的方法
pwd = getpass.getpass('password: ')
print pwd
import pickle    #pickle模块，序列化Python对象
#保存数据到 Pickle 文件
>>> dic = {}
>>> import pickle
>>> with open('dic.pickle', 'wb') as f:
...     pickle.dump(dic, f)
... 
#从Pickle文件读取数据
>>> import pickle
>>> with open('dic.pickle', 'rb') as f:
...      dic = pickle.load(f)
...

1、用户数据通过字典序列化存入account.pickle

cat account.py 
#!/usr/bin/env python
#coding=utf-8
import pickle
 
account = {'1001':{'name':'fgf','pw':123,'money':15000,'balance':15000},
           '1002':{'name':'user','pw':123,'money':15000,'balance':15000}}
f = file('account.pickle','wb')
pickle.dump(account,f)
f.close()
 
with open('account.pickle', 'rb') as f:
        dic = pickle.load(f) 
        f.close()
 
print dic

2、Python程序

#!/usr/bin/env python
#coding=utf-8
import sys,pickle,getpass,time
 
#日志函数
def log(user,describe,fee,balance,**userinfo):
        time1 = time.strftime("%Y-%m-%d %X", time.localtime())
        f = file('account.log','a')
        f.write("%s     %s      %s      ￥%s      ￥%s\n" %(time1,user,describe,fee,balance))
        f.close()
 
        f1 = file('account.pickle','wb')
        pickle.dump(userinfo,f1)
        f1.close()
 
#提现函数
def withdraw(user,**userinfo):
        fee = int(raw_input("请输入提现金额："))
        if fee % 100 ==0 and int(fee*1.05) <= userinfo[user]['balance']:
                charge = fee * 0.05
                balance = userinfo[user]['balance'] - fee - charge
                userinfo[user]['balance'] = balance
                log(user,"取现(手续费%d)"%charge,fee,balance,**userinfo)
                print "你成功取现%d，收取手续费%s，剩余额度%s" %(fee,charge,balance)
        else:
                print "输入金额有误。"
#还款函数
def repay(user,**usrinfo):
        fee = int(raw_input("请输入还款金额："))
        userinfo[user]['balance'] += fee
        balance = userinfo[user]['balance']
        log(user,"信用卡还款",-fee,balance,**userinfo)
        print "你成功还款%d,当前可用额度%s" %(fee,balance)
 
#账单查询
def bills(user):
        f = file('account.log','r')
        time = raw_input("请输入查询的时间(格式:yyyy-mm)：")
        match_yes = 0    #匹配标示
        for line in f.readlines():
                if user in line and time in line:
                        print line,
                        match_yes = 1
        if match_yes == 0 : print"没有查询月份账单"
 
with open('account.pickle','rb') as f:
        userinfo = pickle.load(f)
        f.close()
while True:
        user = raw_input("\33[1;32;40m请输入用户名：\33[0m")
        i = 1
        while userinfo.has_key(user):
                passwd = int(getpass.getpass("\33[1;32;40m请输入密码：\33[0m"))
                while passwd == userinfo[user]['pw']:
                        i = 1   
                        print "欢迎进入系统，请选择操作:"
                        choice = int(raw_input("提现 1\t还款 2\t账单查询 3\t 额度查询 4\t 退出 0\n"))
                        if   choice == 1: withdraw(user,**userinfo)
                        elif choice == 2: repay(user,**userinfo)
                        elif choice == 3: bills(user)
                        elif choice == 4: print "总额度：",userinfo[user]['money'],"当前额度",userinfo[user]['balance']
                        elif choice == 0: sys.exit()
 
                else:
                        i = i + 1
                        print"密码错误！"
                        if i == 4 : break
 
        else : print "没有这个账户。"