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  • 购物车程序作业

    自己写的,代码很low,以后进步了在慢慢改吧。

    作业需求:

    数据结构:
    goods = [
    {"name": "电脑", "price": 1999},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 20},
    {"name": "美女", "price": 998},
    ......
    ]
    
    功能要求:
    基础要求:
    
    1、启动程序后,输入用户名密码后,让用户输入工资,然后打印商品列表
    
    2、允许用户根据商品编号购买商品
    
    3、用户选择商品后,检测余额是否够,够就直接扣款,不够就提醒
    
    4、可随时退出,退出时,打印已购买商品和余额
    
    5、在用户使用过程中, 关键输出,如余额,商品已加入购物车等消息,需高亮显示
    
    
    扩展需求:
    
    1、用户下一次登录后,输入用户名密码,直接回到上次的状态,即上次消费的余额什么的还是那些,再次登录可继续购买
    
    2、允许查询之前的消费记录


    # 运行程序之前,请先执行一次2-5行代码,然后注释掉好了
    with open('user_info.txt', 'w') as f1:
        f1.write('alex|123|0|
    ')  # 用户名|密码|工资|已买物品
        f1.write('jack|123|0|
    ')
        f1.write('mark|123|0|
    ')
    
    # 正式代码
    goods = [
        {"name": "电脑", "price": 1999},
        {"name": "鼠标", "price": 10},
        {"name": "游艇", "price": 20},
        {"name": "美女", "price": 998},
    ]
    
    user_info = {}
    with open('user_info.txt', 'r') as f2:
        for line in f2:
            user = line.strip().split('|')
            user_goods = user[3:-1]
            str_user_goods = '|'.join(user_goods)  # 把已购买的商品转成字符串,因为往文件写入只能写字符串
            user_info[user[0]] = {
                'username': user[0],
                'password': user[1],
                'paycheck': user[2],
                'goods': str_user_goods,
            }
    whether_login = False  # 用来判断是否已经登陆过并且输入过工资
    while True:
        username = input('用户名:').strip()
        password = input('密码:').strip()
        if username in user_info and password == user_info[username]['password']:
            if int(user_info[username]['paycheck']) != 0:
                whether_login = True
                print('您的余额为{},您的购物车商品如下:'.format(user_info[username]['paycheck']))
                print(user_info[username]['goods'])
            if whether_login == False:  # 如果还没有登陆过
                salary = input('请输入工资:').strip()
            else:
                salary = user_info[username]['paycheck']
            if salary.isdigit() and int(salary) > 0:
                salary = int(salary)
                while True:
                    print('商品列表:')
                    for index, item in enumerate(goods):
                        print(index, item['name'], item['price'])
                    goods_code = input('请输入要购买的商品编号,按q退出:').strip()
                    if goods_code.isdigit() and int(goods_code) < len(goods):
                        goods_code = int(goods_code)
                        if salary > goods[goods_code]['price']:
                            salary = salary - goods[goods_code]['price']
                            user_info[username]['paycheck'] = str(salary)
                            user_info[username]['goods'] += goods[goods_code]['name'] + ' |'
                            with open('user_info.txt', 'w') as f3:
                                for i in user_info:
                                    f3.write(
                                        i + '|' + user_info[i]['password'] + '|' + str(
                                            user_info[i]['paycheck']) + '|' +
                                        user_info[i]['goods'] + '
    '
                                    )
                            print('33[31m {0}已加入购物车,余额还剩{1} 33[0m'.format(goods[goods_code]['name'], salary))
                        else:
                            print('余额不足')
                    elif goods_code.lower() == 'q':
                        alreaed_buy = '''
                        ---------- 您购买的商品如下: ----------
                        {}
                        欢迎下次光临
                        '''.format(user_info[username]['goods'])
                        print(alreaed_buy)
                        exit()
                    else:
                        print('超出范围或输入的不是数字类型')
            else:
                print('输入有误,请重新输入,请输入不小于0的整数')
        else:
            print('用户名或密码错误')
            break

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  • 原文地址:https://www.cnblogs.com/lshedward/p/9939137.html
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