author = "superman"

product_list = [    ('Iphone',5800),    ('Mac Pro',9800),    ('Bike',800),    ('Watch',10600),    ('Coffee',31),    ('Alex Python',120),]shopping_list = []salary = input("Input your salary:")if salary.isdigit():            #判断工资是不是数字    salary = int(salary)         #如果是数字就用Int的数据类型    while True:                #进入死循环        for index,item in enumerate(product_list):    #打印商品列表            #print(product_list.index(item),item)            print(index,item)        user_choice = input("选择要买嘛？>>>:")        if user_choice.isdigit():           #判断工资是数字类型            user_choice = int(user_choice)            if user_choice < len(product_list) and user_choice >=0:        #判断商品元素数量                p_item = product_list[user_choice]           #通过下标索引把商品取出来                if p_item[1] <= salary:                 #买的起                    shopping_list.append(p_item)             #能买得起就把商品添加到列表里                    salary -= p_item[1]                    #扣钱                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(p_item,salary) )                else:                    print("\033[41;1m你的余额只剩[%s]啦，还买个毛线\033[0m" % salary)            else:                print("product code [%s] is not exist!"% user_choice)      #输入的商品序号不存在        elif user_choice == 'q':            print("--------shopping list------")            for p in shopping_list:                print(p)            print("Your current balance:",salary)            exit()        else:            print("invalid option")