python15 习题

今日作业：

1、函数对象优化多分支if的代码练熟

if user_state:
    list=[0,1,2]
    dic={
'查询余额请输入','0'
'提现请输入','1'
'转账请输入','2'
    }
    while 1:
        print(dic)
        cmd=input('请输入指令:')
        if cmd in list:
            call(int(cmd))
            break
        else:
            print('无效的指令')
            continue
def call(x):
    if x==0:#查看余额
        check_money()
    elif x==1:#提现
        withdraw_deposit()
    elif x==2:#转账
        transfer()

2、编写计数器功能，要求调用一次在原有的基础上加一
    温馨提示：
        I:需要用到的知识点：闭包函数+nonlocal
        II:核心功能如下：
            def counter():
                x+=1
                return x


    要求最终效果类似
        print(couter()) # 1
        print(couter()) # 2
        print(couter()) # 3
        print(couter()) # 4
        print(couter()) # 5

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
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）
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
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
3、提现功能：用户输入提现金额，db.txt中该账号钱数减少
4、查询余额功能：输入账号查询余额

user_state=0
def login():
    list_1=[]
    tag=1
    # while tag:
    with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f1:
        name=input('请输入账户:').split()
        for line in f1:
            username=line.split(':')[0]
            # print(username)
            userpwd=line.split(':')[1]
            count=line.split(':')[2]
            # print(count)
            money=line.split(':')[3]
            if name == username:
                print(name==usernane)
                pwd=input('请输入密码').strip()
                if userpwd==pwd:
                    print('登录成功')
                    user_state=name
                    tag=0
                    break
                elif userpwd!=pwd:
                    print('密码错误')
                    count+=1
                else:
                    ...
            else:
                ...

        else:
            print('用户不存在请注册')
            # register()
    if count == 3:
        print('用户已锁定')
        tag = 0
        with open (r'C:\Users\Administrator\Desktop\db.txt', mode='rt', encoding='utf-8') as f2:
            for line in f2:
                if line.split(':')[0] == user_state:
                    line = f'{username}:{userpwd}:{count}:{money}\n'
                list4.append(line)
        with open(r'C:\Users\Administrator\Desktop\db.txt', mode='wt', encoding='utf-8') as f3:
            f3.write(list4)

def register():#注册功能
    tag=1
    name_exist=0
    while tag:
        with open (r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding="utf-8") as f1:
            username=input('请输入要注册的账户：').strip()
            for line in f1:
                name=line.split(':')[0]
                # print(name)
                if name==username:
                    print('用户已存在')
                    break
                    tag=0
                    name_exist=1
            else:
                userpwd=input('请输入要注册的密码：').strip()
            if name_exist==0:
                with open(r'C:\Users\Administrator\Desktop\db.txt',mode='wt',encoding='utf-8') as f2:
                    f2.write(f'{username}:{userpwd}:0:0\n')
                break
login()
if user_state:
    list=[0,1,2]
    dic={
'查询余额请输入','0'
'提现请输入','1'
'转账请输入','2'
    }
    while 1:
        print(dic)
        cmd=input('请输入指令:')
        if cmd in list:
            call(int(cmd))
            break
        else:
            print('无效的指令')
            continue
def call(x):
    if x==0:#查看余额
        check_money()
    elif x==1:#提现
        withdraw_deposit()
    elif x==2:#转账
        transfer()


def check_money():#查询余额
    with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f1:
        for line in f1:
            if line.split(':')[0]==user_state:
                res=line.strip().split(':')[3]
                print(res)

def withdraw_deposit():#提现
    is_withdraw_deposit=0
    with open(r'C:\Users\Administrator\Desktop\db.txt', mode='rt', encoding='utf-8') as f1:
        amount=input('请输入提款金额：')
        if not amount.isdigit():
            print('输入错误')
        else:
            for line in f1:
                if line.split(':')[0] == user_state:
                    money = line.strip().split(':')[3]
                    if int(res)-int(amount)>0:
                        left_money=int(res)-int(amount)
                        is_withdraw_deposit = 1
                        new_line=line.replace(f'{money}',f'{left_money}')
                        pass
                    else:
                        print('余额不足')
    if is_withdraw_deposit:
        list4=[]
        with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f2:
            for line in f2:
                if line.split(':')[0] == user_state:
                    line=new_line
                list4.append(line)
        with open (r'C:\Users\Administrator\Desktop\db.txt',mode='wt',encoding='utf-8') as f3:
            f3.write(list4)

def transfer():#转账
    is_transfer = 0
    with open(r'C:\Users\Administrator\Desktop\db.txt', mode='rt', encoding='utf-8') as f1:
        transfer_name=input('请输入要转入的账户：')
        amount=input('请输入转账金额：')
        if not amount.isdigit():
            print('输入错误')
        else:
            for line in f1:
                if line.split(':')[0]==transfer_name:
                    pass
            else:
                print('不支持对外账户哦 0.0')
            for line in f1:
                if line.split(':')[0] == user_state:
                    money = line.strip().split(':')[3]
                    if int(res)-int(amount)>0:
                        left_money=int(res)-int(amount)
                        is_transfer = 1
                        new_line=line.replace(f'{money}',f'{left_money}')
                        pass
                    else:
                        print('余额不足')
            for line in f1:
                if line.split(':')[0] == transfer_name:
                    money2 = line.strip().split(':')[3]
                    left_money2 = int(money2)+ int(amount)
                    new_line2=line.replace(f'{money2}',f'{left_money2}')
    if is_transfer:
        list5=[]
        with open(r'C:\Users\Administrator\Desktop\db.txt',mode='rt',encoding='utf-8') as f2:
            for line in f2:
                if line.split(':')[0] == user_state:
                    line=new_line
                elif line.split(':')[0] == transfer_name:
                    line=new_line2
                list5.append(line)

        with open (r'C:\Users\Administrator\Desktop\db.txt',mode='wt',encoding='utf-8') as f3:
            f3.write(list5)

来源：https://www.cnblogs.com/Franciszw/p/12550098.html