product_list = [
        (‘Iphone‘,5800),
        (‘Mac Pro‘,9980),
        (‘Bike‘,800),
        (‘watch‘,10600),
        (‘Coffee‘,31),
        (‘AlexPython‘,80),
]
shop_list = []
salary = input("Please input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
                        #print(product_list.index(item),item)enumerate
            print(index,item)
                         #break
        user_choice = input ("选择要买什么")
        if user_choice.isdigit():
            user_choice=int(user_choice)
            if user_choice <len(product_list)and user_choice>=0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary:
                    shop_list.append(p_item)
                    salary -= p_item[1]
                    print("Added %s into shopping cart,your current balance is \033[31;1m%s\033[0m"%(p_item,salary))
                else:
                 print("\033[42;1m你余额只剩[%s]；啦，还买个毛线啊\033[0m" % salary)
            else:
                print("product code [%s] is not exist !"% user_choice)
        elif user_choice ==‘q‘:
            print("---------------shopping list-----------")
            for p in shop_list:
                print(p)
            print("Your current balance:",salary)
            exit()
        else:
            print("invalid option")

菜鸟生活（python）之购物车列表