3.22周末作业

# 编写ATM程序实现下述功能，数据来源于文件db.txt
# 0、注册功能：用户输入账号名、密码、金额，按照固定的格式存入文件db.txt
# def  regeister():
#     dic={}
#     with open('db.txt','r',encoding='utf-8')as f:
#         for line in f :
#             name,pwd,money=line.strip().split(':')
#             dic[name]=[pwd,money]
#     while 1:
#         username = input('请输入用户名: ').strip()
#         if not username in dic:
#             password = input('请输入密码: ').strip()
#             re_password = input('请输入密码: ').strip()
#             count=input('请输入金钱:').strip()
#             if password==re_password:
#                 print('注册成功')
#                 with open("db.txt","a",encoding='utf-8') as w:
#                     w.write(f'{username}:{password}:{count}
')
#                 break
#             else:
#                 print('密码不一致')
#         else:
#             print('账户已存在')


# regeister()


# 1、登录功能：用户名不存在，要求必须先注册，用户名存在&输错三次锁定，登录成功后记录下登录状态（提示：可以使用全局变量来记录）
user_info = {'user': None}
def  login():
    dic = {}
    with open('db.txt', 'r', encoding='utf-8')as f:
        for line in f:
            name, pwd, money = line.strip().split(':')
            dic[name] = [pwd, money]
    number=0
    while number<3:
        username = input('请输入用户名: ').strip()
        if  username in dic:
            password = input('请输入密码: ').strip()
            if password==dic[username][0]:
                print('登录成功')
                user_info['user']=username
                break
            else:
                print('登录失败')
                number+=1
                if number==3:
                    print(f'账户{username}被锁定')
                    break
        else:
            print('===开始注册====')
            regeister()
            return login()



# login()





# 下述操作，要求登录后才能操作
# 1、充值功能：用户输入充值钱数，db.txt中该账号钱数完成修改
# def pay_money(x):
#     dic = {}
#     with open('db.txt', 'r', encoding='utf-8')as f:
#         for line in f:
#             name, pwd, money = line.strip().split(':')
#             dic[name] = [pwd, int(money)]
#     while 1:
#         username = input('请输入用户名: ').strip()
#         if not user_info.get('user'):
#             login()
#         else:
#             dic[username][1]+=x
#             with open('db.txt', 'r+', encoding='utf-8')as f2:
#                 for i in dic:
#                     f2.write(f'{i}:{dic[i][0]}:{dic[i][1]}
')
#             break
# pay_money(10)


# 2、转账功能：用户A向用户B转账1000元，db.txt中完成用户A账号减钱，用户B账号加钱
def transfer(A,B,x):
    dic = {}
    with open('db.txt', 'r', encoding='utf-8')as f:
        for line in f:
            name, pwd, money = line.strip().split(':')
            dic[name] = [pwd, int(money)]
    while 1:
        if not user_info.get('user'):
            login()
        if A not in dic:
            print('转账用户不存在')
            return

        if B not in dic:
            print('收款用户不存在')
            return

        if dic[A][1]>= x:

            dic[A][1] -= x
            dic[B][1] +=x
            with open('db.txt', 'r+', encoding='utf-8')as f2:
                for i in dic:
                    f2.write(f'{i}:{dic[i][0]}:{dic[i][1]}
')
            break
# transfer('egon','tank',20)



# 3、提现功能：用户输入提现金额，db.txt中该账号钱数减少
def withdraw(x):
    dic = {}
    with open('db.txt', 'r', encoding='utf-8')as f:
        for line in f:
            name, pwd, money = line.strip().split(':')
            dic[name] = [pwd, int(money)]
    while 1:
        username = input('请输入用户名: ').strip()
        if not user_info.get('user'):
            login()
        else:
            dic[username][1]-=x
            with open('db.txt', 'r+', encoding='utf-8')as f2:
                for i in dic:
                    f2.write(f'{i}:{dic[i][0]}:{dic[i][1]}
')
            break










# 4、查询余额功能：输入账号查询余额
def check_money(F):
    dic = {}
    with open('db.txt', 'r', encoding='utf-8')as f:
        for line in f:
            name, pwd, money = line.strip().split(':')
            dic[name] = [pwd, int(money)]
    while 1:
        if not user_info.get('user'):
            login()
        else:
            print(dic[F][1])
            break



check_money('tank')