代码练习，购物车

1. 高亮显示提示

2. 启动程序后，先登录，登录成功则让用户输入充值钱数,然后打印商品列表，失败则重新登录，超过三次则退出程序

3. 允许用户根据商品编号购买商品

4. 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

5. 可随时退出，退出时，打印已购买商品

#   -*- coding:utf-8 -*-

dic = {'alex': {'password': 'qwer', 'count': 0, 'balance': 0},
       'lilei': {'password': 'asdf', 'count': 0, 'balance': 0},
       'jim': {'password': 'zxcv', 'count': 0, 'balance': 0}}

goods = [
    {"name": "电脑", "price": 1999},
    {"name": "鼠标", "price": 10},
    {"name": "游艇", "price": 20},
    {"name": "美女", "price": 998}, ]
shopping_cart = []
light_s = '\033[1;31;46m%s元\033[0m'
loop = True
while loop:
    f = open(file='blacklist.txt', mode='r', encoding='utf-8')
    blacklist = f.read()
    f.closed
    input_user = input('请输入您的用户名：').strip()
    if input_user in blacklist:
        print('很抱歉您的账户已被锁定')
    else:
        if input_user in dic:
            input_password = input('请输入您的密码：').strip()
            if input_password == dic[input_user]['password']:
                print('登录成功，您的账户余额还有', light_s % (dic[input_user]['balance']))
                recharge = input('是否进行充值？请输入充值的钱数，回车键继续')
                if recharge.isdigit():
                    recharge = int(recharge)
                    dic[input_user]['balance'] += int(recharge)
                    print('当前余额为:', light_s % (dic[input_user]['balance']))
                print('商品列表'.center(50, '-'))
                print('-序号-', '商品'.center(4, '-'), '价格'.center(4, '-'))
                while loop:
                    for index, i in enumerate(goods):
                        print(' %s    %s   %s ' % (index, i['name'], i['price']))
                    choice = input("请输入您要购买的商品序号,按'q'键退出")
                    if choice.isdigit():
                        choice = int(choice)
                        if choice >= len(goods):
                            print('\033[1;31;46m您所选择的商品不存在\033[0m')
                            continue
                        if dic[input_user]['balance'] >= int(goods[choice]['price']):
                            dic[input_user]['balance'] -= int(goods[choice]['price'])
                            print('购买成功，花费', light_s % (goods[choice]['price']), '余额还剩',
                                  light_s % dic[input_user]['balance'])
                            shopping_cart.append(goods[choice])
                        else:
                            print('余额不足，您的账户余额还有', light_s % (dic[input_user]['balance']))
                            recharge = input('是否进行充值？请输入充值的钱数，回车键继续')
                            if recharge.isdigit():
                                recharge = int(recharge)
                                dic[input_user]['balance'] += int(recharge)
                                print('当前余额为:', light_s % (dic[input_user]['balance']))

                    elif choice == 'q':
                        print('您购买的商品列表清单如下')
                        for i in shopping_cart:
                            print(i['name'], i['price'])
                        print('\033[1;31;46m欢迎再来\033[0m')
                        loop = False
                    else:
                        print('\033[1;31;46m请输入正确的序号\033[0m')

            else:
                print('\033[1;31;46m密码错误\033[0m')
                dic[input_user]['count'] += 1
                if dic[input_user]['count'] > 2:
                    f = open(file='blacklist.txt', mode='a', encoding='utf-8')
                    f.write('%s ' % input_user)
                    print('\033[1;31;46ml您的账号已被加入黑名单\033[0m')
                    f.closed
                    break
        else:
            print('您输入的用户名不存在')