product_list = [
    [‘Iphone‘,5888],
    [‘Mac Air‘,8000],
    [‘XiaoMi‘,19.9],
    [‘coffee‘,30],
    [‘Tesla‘,820000],
    [‘Bike‘,700],
    [‘Cloth‘,200],   ]
l=[]
shop_car=[]
salary=int(input("请输入您的工资： "))
while True:
    index=0
    for i in  product_list:
        print(index,i)
        index+=1
    choice=input("请输入商品编号 w保存，q 退出： ")
    if choice.isdigit():
        choice=int(choice)
        if  choice > 0 and choice <= len(product_list):
            product=product_list[choice]
            if salary >= product[1]:
                shop_car.append(product)
                salary -= product[1]
            else:
                print("余额不足")
        else:
            print("您输入的商品编号不存在")

    elif choice == ‘w‘:
        print("---已经购买的商品列表---")
        l=[]
        for i in shop_car:
            if i not in l:
                l.append(i)
                l.append(shop_car.count(i))
        print(l)

        print("您的余额 %s" % salary)
        print("end-----------")
        break
    else:
        exit("退出程序")