python3 三级菜单

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Hiuhung Wan


menu = {
    "电器": {
        "电视": {
            "曲面": {},
            "超薄": {},
            "4k": {},
        },
        "空调": {
            "柜式": {},
            "变频": {},
            "单冷": {},
        },
        "冰箱": {
            "单门": {},
            "双门": {},
            "三门": {},
        },
    },
    "手机类": {
        "手机": {
            "智能手机": {},
            "老人手机": {},
            "对讲机": {},
        },
        "配件": {
            "壳": {},
            "膜": {},
            "TF卡": {},
        },
        "数码": {
            "读卡器": {},
            "三角架": {},
            "手柄": {},
        },
    },
    "电脑": {
        "电脑整机": {
            "笔记本": {},
            "游戏本": {},
            "平板": {},
        },
        "电脑配件": {
            "CPU": {},
            "SSD": {},
            "HDD": {},
        },
        "外设": {
            "键盘": {},
            "鼠标": {},
            "摄像头": {},
        },
    },
}

flag = True

while flag:

    for i in menu:
        print(i)

    user_chiose_1 = input("第一层：")
    if user_chiose_1 in menu:
        while flag:
            
            for x in menu[user_chiose_1]:
                print("\t%s" %(x))
                
            user_chiose_2 = input("第二层：")
            if user_chiose_2 in menu[user_chiose_1]:

                while flag:
                    
                    for y in menu[user_chiose_1][user_chiose_2]:
                        print("\t\t%s" % (y))
                    user_chiose_3 = input("已是第三层了，按b返回或按q退出")
                    if user_chiose_3 in menu[user_chiose_1][user_chiose_2]:
                        for z in menu[user_chiose_1][user_chiose_2][user_chiose_3]:
                            print("\t\t\t%s" % (z))

                    elif user_chiose_3 == ("q" or "Q"):
                        flag = False
                    elif user_chiose_3 == ("b" or "B"):
                        break
                    else:
                        print("输入非法，请检查！")

            elif user_chiose_2 == ("q" or "Q"):
                flag = False
            elif user_chiose_2 == ("b" or "B"):
                break
            else:
                print("输入非法，请检查！")

    elif user_chiose_1 == ("q" or "Q"):
        flag = False
    elif user_chiose_1 == ("b" or "B"):
        break
    else:
        print("输入非法，请检查！")
#!/usr/bin/env pyt