python通过字典实现购物车案例-用户端

import os

dict01 = {
    "iphone" : {
    "5999" : { 
    "总部位于美国" : "价格相对较贵",
    },
    },
    "wahaha" : {
    "15" : {
    "总部位于中国" : "经济实惠，大众喜爱",
    },
    },
    "MacBook Air" : {
    "15000" : {
    "苹果公司笔记本" : "性能优越，续航惊人",
    },
    },
    "矿泉水" : {
    "2" : {
    "产自山区,富含矿物质" : "解渴，人人需要",
    },
    },
    
}

if os.path.exists("money.txt") :
    with open("money.txt", "r", encoding="utf-8-sig") as m01:
        budget = m01.read()
        budget = budget.strip()
    answer = input("当前预算为{0},是否增加预算?（y/n）".format(budget))
    if answer == "y" :
        budgetNew = input("你的预算是多少？")
        budget = int(budgetNew) + int(budget)
        print("目前预算为{0}".format(budget))       
else :
    budget = input("你的预算是多少？")

Continue = False
shoppingCart = []
budget = int(budget)

while not Continue :
    # budget 购买物资预算
    print("商品清单如下：")
#     将商品名称取出，保存到列表中
    product = list(dict01.keys())
#     遍历输出所有的商品
    for index,list01 in enumerate(product):
        print(index,list01,list(dict01[list01].keys())[0] + "元")
    choice = input("请输入你的选择是：")
#     判断输出值是否为数字
    if choice.isdigit():
#         字符串转换为数字类型
        choice = int(choice)
        if choice < len(product) and choice >= 0:
#             获取商品价格
            shoppingName = product[choice]
#             print(shoppingName)
            choicePrice = int(list(dict01[shoppingName].keys())[0])
            if budget >= choicePrice :
#                 选购商品保存在列表中
                shoppingCart.append(product[choice])
                budget -= choicePrice
                print("你的余额还有" + str(budget) + "元。")
            else :
                print("你买不起这个商品!")
        else :
            print("没有这个商品，请重新选择。")
            break
    elif choice == "q":
        Continue = True
        print("
你购买的清单如下：")
        print(shoppingCart)
        print("你的余额还有" + str(budget) + "元。
")
        with open("money.txt", "w", encoding="utf-8-sig") as m :
            m.write(str(budget))
        break
    else :
        print("请重新输入，按q退出！")
        break