ATM

import  os
def login(*args):
    """登录"""
    in_username = input("请输入您的账号：")
    in_paaswd = input("请输入您的密码：")
    with open(‘user.txt‘,mode=‘rt‘,encoding=‘utf-8‘) as f:
        for line in f:
            username1,paswd = line.strip().split(‘,‘)
            if in_username == username1 and in_paaswd == paswd:
                print(‘登录成功‘)
                break

        else:
            print(‘登录失败‘)

def registered():
    """注册"""
    newuser=input("请输入您的用户名：")
    newpaswd=input("请输入您的密码：")
    moeny = input("请输入您的余额")
    with open(‘user.txt‘,mode=‘rt‘,encoding=‘utf-8‘) as f,        open(‘user.txt‘,mode=‘at‘,encoding=‘utf-8‘) as f1,        open(‘db.txt‘,mode=‘at‘,encoding=‘utf-8‘) as f2:
            for line in f:
                user,paswd = line.strip().split(‘,‘)
                if user != newuser:
                    f1.write(‘{}:{}‘.format(newuser,newpaswd))
                    f2.write(‘{}:{}‘.format(newuser,moeny))
                    print("注册成功")
                elif newuser == user:
                    print("用户已经存在")
                    break




def withdraw():
    """"提现"""
    user=input("请输入账号：")
    hq=int(input("请输入要提取的额度："))
    dic = {} #定义空字典
    with open(‘db.txt‘,mode=‘rt‘,encoding=‘uft-8‘) as f,        open(‘.db.txt.sawp‘,mode=‘wt‘,encoding=‘utf-8‘) as f1:
        for line in f:
            username,moneny= line.strip().split(‘,‘)
            dic[username]=int(moneny)
        print("还剩余额度为",dic[user])
        if dic.get(moneny) > hq:
            print("余额不足")
        else:
            dic[user] -= (hq * 0.5)
            print(‘还剩余‘,dic[user])
            for username,moneny in dic.items():
                f1.write(f‘{username}:{moneny}\n‘)
    os.remove(‘db.txt‘)
    os.rename(‘.db.txt.swap‘,‘db.txt‘)

def hub():
    """转账"""
    source=input("请输入账号:")
    end = input("请输入目标账号：")
    moeny= int(input("请输入转账金额"))
    dic={}
    with open(‘db.txt‘,mode=‘rt‘,encoding=‘utf-8‘) as f,        open(‘.db.txt‘,mode=‘wt‘,encoding=‘utf-8‘) as f1:
        for line in f:
            username,moeny1 =line.strip().split(‘,‘)
            dic[username] = int(moeny1)
            print(‘您的账户余额为‘,dic[source])
        if dic.get(source) > moeny:
            dic[source] -= moeny # 原用户扣钱
            dic[end] += moeny # 目标用户加钱
            print("成功转账，您的账户余额",dic[source])
        elif dic.get(source) < moeny:
            print("余额不足")
        for username,moeny1 in dic.items():
            f1.write(f‘{username},{moeny1}\n‘)
    os.remove(‘db.txt‘)
    os.rename(‘.db.txt‘,‘db.txt‘)

def also():
    """还款"""
    in_user=input("请输入您的账号")
    in_moeny=int(input("请输入还款金额"))
    dic={}
    with open(‘db.txt‘,mode=‘rt‘,encoding=‘utf-8‘) as f,        open(‘.db.txt‘,mode=‘wt‘,encoding=‘utf-8‘) as f1:
        for line in f:
            username,moeny = line.strip().split(‘,‘)
            dic[username]=int(moeny)
        print("您的账户余额",dic[in_user])
        dic[in_user] += in_moeny
        for username,moeny in dic.items():
            f1.write(‘{username}:{moeny}\n‘)
        os.remove(‘db.txt‘)
        os.rename(‘.db.txt‘,‘db.txt‘)
select=‘1 登陆 ，2 注册，3 转账 ，4 还款 ‘
print(select)


operating=input("请选择你的操作")
if operating == ‘1‘:
    login()
elif operating == ‘2‘:
    registered()
elif operating == ‘3‘:
    hub()
elif operating == ‘4‘:
    also()
else:
    print("非法操作")