python日记，购物车程序

# readme：
#     ne_zha
#     blogger address:www.cnblogs.com/ne-zha

#     要求：
#       1.启动程序，让用户输入存款，然后打印商品列表
#       2.允许用户根据商品编号选择购买商品
#       3.用户选择完商品后检测余额是否足够扣款，满足提示扣款成功，不满足提示余额不足
#       4.可随时退出，退出时打印购买商品和余额

savings =input(‘请输入您的存款：‘)
commodity_list =[(‘iphone7‘,5888),(‘bike‘,1500),(‘huaweiP9‘,3666),(‘headset‘,199)]
if savings.isdigit():
    savings =int(savings)
    while True:
        for item in enumerate(commodity_list):
            print(item)
        user_choice =input(‘请输入您想要的商品编号：‘)
        if user_choice.isdigit():
            user_choice =int(user_choice)
            if user_choice < len(commodity_list) and user_choice >= 0:
                choice = commodity_list[user_choice]
                price_choice =choice[1]
                if price_choice<=savings:
                    buy_user =[]
                    buy_user.append(choice[0])
                    print(‘商品\033[1;31;40m%s\033[0m已加入购物车‘%choice[0])
                    savings-=price_choice
                    print(‘余额：\033[1;31;40m%s\033[0m‘%savings)
                else:
                    print(‘余额不足，购买失败！‘)
            else:
                print(‘商品输入有误，请重新输入：‘)
        elif user_choice ==‘q‘:
            print(‘您已买的商品清单与余额：‘)
            for i in buy_user:
                print(‘\033[1;31;40mi\033[0m)
                print(‘\033[1;31;40msavings\033[0m‘)
                exit()
        else:
            print(‘invalid option‘)