购物车

product_list = [
    (‘iphone6s‘,5800),
    (‘kindle‘,800),
    (‘tesla‘, 900000),
    (‘python book‘, 105),
    (‘bike‘,2000),
]
salary = input("Salary:")#输入工资
shopping_car = []


if salary.isdecimal():
    salary=int(salary)
    while True:

        #打印商品内容
        for i,v in enumerate(product_list,1):
            print(i,‘>>>>‘,v)

        #引导用户选择商品
        choice = input("选择商品编号[退出:q]:")

        #验证输入是否合法
        if choice.isdigit():
            choice = int(choice)

            if choice > 0 and choice <= len(product_list):
                #将用户选择商品通过choice取出来
                p_iterm = product_list[choice-1]

                #如果钱够，用本金salary减去该商品价格，并将该商品加入购物车
                if p_iterm[1]<salary:
                    salary -= p_iterm[1]
                    shopping_car.append(p_iterm)
                else:
                    print(‘余额不足,还剩%s‘%salary)
                    
                print(p_iterm)  
            else:
                print(‘编码不存在‘)
            
        elif choice == ‘q‘:
            print(‘-----------您已购买如下商品---------‘)
            #循环遍历购物车里面的商品，购物车存放的是已买商品
            for i in shopping_car:
                print(i)
            print(‘您还剩%s元钱‘%salary)
            break
            
        else:
            print(‘invalid input‘)