购物功能

# 产品列表
product_list = [
    ('红米note5', 1099),
    ('红米s2', 999),
    ('红米6', 799),
    ('红米6A', 599),
    ('小米8', 1799),
    ('小米MAX3', 1699),
    ('小米MIX2S', 3299),
]
shop_list = []

salary = input('请输入工资：')
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
            print('商品编号：{} {}'.format(index, item))
        user_choice = input('请输入您要购买的商品编号，退出请输入q')
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if 0 <= user_choice < len(product_list):
                p_item = product_list[user_choice]
                if salary >= p_item[1]:
                    shop_list.append(p_item)
                    salary -= p_item[1]
                    print('已购买商品：{},余额：33[31;1m{}33[0m'.format(shop_list,salary))
                else:
                    print('余额不足，剩余：33[31;1m{}33[0m'.format(salary))
            else:
                print('暂无此产品，请重新选择')
        elif user_choice == 'q':
            print('-' * 10, '已购买商品', '-' * 10)
            for p in shop_list:
                print(p)
            print('余额：33[31;1m{}33[0m'.format(salary))
            exit()
        else:
            print('...')