多级菜单练习

三级菜单

1. 打印一级菜单，选择项目
2. 打印二级菜单，选择项目
3. 打印三级菜单，选择项目后退出程序
4. 选择b返回上级菜单
5. 选择q退出程序

menu = {
    "烤肉":{
        "牛肉":["牛五花","牛肋条"],
        "羊肉":["羊肉串","大肥腰子"],
        "鱼肉":["烤三文鱼头","烤秋刀鱼"]
    },
    "寿司":{
        "握寿司":["三文鱼握寿司","金枪鱼握寿司"],
        "军舰寿司":["三文鱼军舰","金枪鱼军舰"],
        "刺身":["金枪鱼刺身","赤贝刺身"]
    },
    "饮料":{
        "红酒":["波尔多","赤霞珠"],
        "啤酒":["朝日","麒麟"],
        "清酒":["松竹梅","芋头烧"]
    }

}
while True:
    for i in menu:
        print(i)
    choice1 = input("输入你的选择：（q退出）")
    if choice1 in menu:
        while True:
            for i2 in menu[choice1]:
                print(i2)
            choice2 = input("输入你的选择：(b返回 q退出)")
            if choice2 in menu[choice1]:
                while True:
                    for i3 in menu[choice1][choice2]:
                        print(i3)
                    choice3 = input("输入你的选择：(b返回 q退出)")
                    if choice3 == 'b':
                        break
                    elif choice3 == 'q':
                        exit()
                    else:
                        print("你点了%s" %choice3)
                        break
            elif choice2 =='b':
               break
            else:
                quit()
    else:
        quit()