购物车

shopping_car = []
product_list = [
    (‘Mac‘,9000),
    (‘kindle‘,800),
    (‘tesla‘,900000),
    (‘python book‘,105),
    (‘bike‘,2000),

]

saving=input(‘please input your saving:‘)

if saving.isdigit():
    saving = int(saving)
    while True:

        for i,v in enumerate(product_list,1):
            print(i,v)
        choice = input(‘选择购买商品编号[退出：q}: ‘)　　#i v输出的结果为什么是颠倒的？

        if choice.isdigit():

            choice=int(choice)
            if choice > 0 and choice <= len(product_list):
                p_item = product_list[choice-1]
                if p_item[1] < saving:   #p_item[1]为取列表里价格的位置
                    saving -= p_item[1]
                    shopping_car.append(p_item)
                else:
                    print(‘余额不足,还剩%s‘%saving)
                print(p_item)
            else:
                print(‘编码不存在‘)
        elif choice == ‘q‘:
            print(‘-----------您以及购买如下商品------------‘)
            for i in shopping_car:
                print(i)
            print(‘还剩%s元‘%saving)
            break
        else:
            print(‘请输入编码‘)