Implementation of level three menus (Python program)

This is just beginning to write the program, the three-level menu program is basically a dictionary implementation, very low, after learning other better things, I will continue to upload, and then strive for in my level of advanced, the simple things to achieve the ruthless tall on.

_author_ ="Zhanzhengrecheng"Data={    "Shaanxi":{        "Baoji":{"Fufeng County":["Duan Jia Zhen","Cheng Guan"],},        "Weinan":{},        "Yanan":{},        "Xian":{},        },    "Hebei":{        "Baoding":{"Tang County":["Yang Zhuang","Huang Zhuang"]},        "Shijiazhuang":{},        "Tangshan":{},        "Hengshui": {},},}exit_flag=False while  notExit_flag: forI1inchData:Print(i1) Choice1= Input ("choose to enter 1111>>:")    ifChoice1inchData: while  notExit_flag: forI2inchData[choice1]:Print("\ t", I2) Choice2= Input ("choose to enter 2222>>:")            ifChoice2inchData[choice1]: while  notExit_flag: fori3inchData[choice1][choice2]:Print("\t\t", i3) Choice3= Input ("choose to enter 3333>>:")                    ifChoice3inchData[choice1][choice2]: forI4inchData[choice1][choice2][choice3]:Print("\t\t\t", I4) Choice4= Input ("last layer, press B to return")                        ifChoice4 = ="b":                             Pass                        elifChoice4 = ="Q": Exit_flag=TrueifChoice3 = ="b":                         Break                    elifChoice3 = ="Q": Exit_flag=TrueifChoice2 = ="b":                 Break            elifChoice2 = ="Q": Exit_flag= True

Not yet ready to add .....

Implementation of level three menus (Python program)