# Author: Lockegogo


things = [
    ["pen", 30],
    ["macbook", 5000],
    ["ipad", 3000],
    ["iphone", 6000],
    ["book", 100]
]

money = input("please input your money: ")
mythings = []

if money.isdigit():
    money = int(money)
    while True:
        for index, item in enumerate(things):  #把列表的下标取出来
            print(index, item)
            #print(things.index(item), item)

        user_choice = input("choose one things: ")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(things)  and user_choice > -1:   #len用来取列表的动态长度
                p_item = things[user_choice]
                if p_item[1] <= money:
                    mythings.append(p_item)
                    money = money - p_item[1]
                    print("Added %s into your shopping list, your current balance is \033[31;1m%s\033[0m" %(p_item, money))
                else:
                    print("\033[33;1myour money is insufficient!\033[0m")
                    continue
            else:
                print("invalid input!")
                continue



        elif user_choice == "q":
            print("your shopping lists are:")
            for i in mythings:
                print(i)
            print("your current money is: ", money)
            exit()   #退出

        else:
            print("invalid option")
            continue