Python ATM模拟系统

花了半天把2.x的语法改成了3.x，补齐了部分功能

先说下遇到的几个区别:

1.print

2.x里 　　print "Hello World!!"

3.x里　　 print("Hello World!!!")

2.input

2.x里面用 　　raw_input()

3.x里只有　　input()

3.字典的has_key()方法,python3以后删除了has_key()方法

2.x　　 dic.has_key('xxx')

3.x　　 key in dic

然后是思路，因为老师要求数据要永久保存，所以我用了两个txt文本，在程序启动前读入文本内容，在程序执行完毕后，将字典内容写入文本，代码如下

其他功能大概都是常规思路

#coding=utf-8
import os
#read txt into dic
User_Pwd = {}
User_Money={}
def open_User_Pwd():
    if(os.path.exists('User_Pwd_file.txt')):
        User_Pwd_file = open('User_Pwd_file.txt', 'r')
        for line in User_Pwd_file:
            line = line.strip().split(':')
            User_Pwd[line[0]]=line[1]
        User_Pwd_file.close()
    else:
        User_Pwd_file = open('User_Pwd_file.txt', 'w')
        User_Pwd_file.close()


def open_User_Money():
    if(os.path.exists('User_Money_file.txt')):
        User_Money_file = open('User_Money_file.txt', 'r')
        for line in User_Money_file:
            line = line.strip().split(':')
            User_Money[line[0]] = line[1]
        User_Money_file.close()
    else:
        User_Money_file=open('User_Money_file.txt','w')
        User_Money_file.close()

# write User-password into txt
def Write_User_Pwd():
     User_Pwd_file = open('User_Pwd_file.txt','w')
     for key in User_Pwd:
        User_Pwd_file.write(key +":" + User_Pwd[key]+'
')
     User_Pwd_file.close()

#write User-Money into txt
def Write_User_Money():
     User_Money_file=open('User_Money_file.txt','w')
     for key in User_Money:
         User_Money_file.write(key +":" +str(User_Money[key])+'
')
     User_Money_file.close()

def MainMeun():
    open_User_Pwd()
    open_User_Money()
    print("=====欢迎使用蜗牛ATM无限制存取款系统=====")
    print("===请输入选项：1.登陆  2.注册 3.退出===")
    print("=========================================")
    choice =input()
    if choice=='1':
        print("=====欢迎来到登录模块=====")
        login()
    elif choice=='2':
        print("=====欢迎来到注册模块=====")
        register()
    elif choice=='3':
        print("=====你即将退出系统=====")
        exit()
    else:
        print("=====请输入正确的选项=====")
        MainMeun()

#login
def login():
        UserName = input("请输入您的账号:").strip()

        n=0
        t=0

        while (n<2):
           if (not UserName in User_Pwd):
                n=n+1
                print ("对不起，请重新输入")
                UserName = input("请输入您的账号:").strip()
           else:
               if(t>2):
                   exit()
               else:
                   UserPassword = input("请输入您的密码 :").strip()
                   if(not User_Pwd[UserName]==UserPassword):
                       t=t+1
                       print ("对不起，请重新输入")
                   else:
                       global CurrentName
                       CurrentName = UserName
                       level_two()
                       break



#level_two
def level_two():
    print ("请输入选项")
    print("1.查询余额 
" "2.转账
"
          "3.取现
""4.存钱
"
           "5.回到主菜单
""6.退出"
          )
    choice2=input()
    if (choice2=='1'):
        print("=====查询余额=====")
        CheckBalance()
    elif(choice2=='2'):
        print ("=====转账=====")
        MoneyTransfer()
    elif(choice2=='3'):
        print("=====取现=====")
        getcash()
    elif(choice2=='4'):
        print("=====存钱=====")
        savecash()
    elif(choice2=='5'):
        print("=========================================")
        MainMeun()
    elif(choice2=='6'):
        exit()
    else:
        print("请输入正确的选项：")
        level_two()


#1.check the balance
def CheckBalance():
    UserName =input("请输入账户:")
    if (UserName in User_Money):
        print("当前账户是 " + UserName)
        print ("当前余额是 " + User_Money[UserName])
        print ("-------------------------------------------------------------------")
        level_two()
    else:
        print("请输入正确的账号")
        CheckBalance()


#2.转账
def MoneyTransfer():
    print("当前的账户是 " + CurrentName)
    TransferName=input("请输入要转入的账号: ")
    if(TransferName in User_Money and not CurrentName==TransferName):
        TransferMoney=input("请输入要转入的金额: ")
        if(TransferMoney.isdigit() and int(User_Money[CurrentName])>=int(TransferMoney)):
            User_Money[CurrentName]= int(User_Money[CurrentName])-int(TransferMoney)
            User_Money[TransferName]=int(User_Money[TransferName])+int(TransferMoney)
            Write_User_Money()
            print(CurrentName + "余额是 " + str(User_Money[CurrentName]))
            print(TransferName+ "余额是 " + str(User_Money[TransferName]))
            level_two()
        else:
            print("!!!!!!!!!!!!!请输入正确的金额!!!!!!!!!!!")
            MoneyTransfer()
    else:
        print("!!!!!!!!!!!!!!请输入正确的用户名!!!!!!!!!!!!!!!")
        MoneyTransfer()

#取现
def getcash():
    print("当前账号是："+ CurrentName)
    print("当前的余额是："+str(User_Money[CurrentName]))
    num = input("请输入取现金额:")
    if(num.isdigit()):
        if(int(User_Money[CurrentName])>=int(num) and int(num)>0):
            User_Money[CurrentName]=int(User_Money[CurrentName])-int(num)
            Write_User_Money()
            print("取现后剩余金额：" + str(User_Money[CurrentName]))
            level_two()
        else:
            print("余额不足！！！")
    else:
        print("请输入数字！！！")

#存钱
def savecash():
    print("当前账号是：" + CurrentName)
    print("当前的余额是：" + str(User_Money[CurrentName]))
    num = input("请输入存入金额:")
    if (num.isdigit() and int(num) > 0):
        User_Money[CurrentName] = int(User_Money[CurrentName]) + int(num)
        Write_User_Money()
        print("存入后剩余金额：" + str(User_Money[CurrentName]))
        level_two()
    else:
        print("输入错误！！！")
        print('---------------------------------------------------------')
        level_two()





#register
def register():
    UserName=input("请输入用户名:")
    if UserName in User_Pwd:
        print("用户名已存在，请重新输入")
        register()
    else:
     UserPwd=input("请输入密码:")
     User_Pwd[UserName] = UserPwd
     User_Money[UserName]=int(5000)
     print("恭喜你，注册成功")
     print("Your User Name is " + UserName)
     print ("You have money:$5000")
     Write_User_Pwd()
     Write_User_Money()
     MainMeun()

MainMeun()