Python program 3--level three menu program

Program: Level Three Menu

Requirements:

1. Print provincial, city, and county level three menus
2. Can return to the upper level
3. Can exit the program at any time

1menu = {2     'Beijing':{3         'Haidian':{4             'Five crossing':{5                 'Soho':{},6                 'NetEase':{},7                 'Google':{}8             },9             'Zhongguancun':{Ten                 'Iqiyi Art':{}, One                 'Autohome':{}, A                 'Youku':{}, -             }, -             'on the ground':{ the                 'Baidu':{}, -             }, -         }, -         'changping':{ +             'Shahe':{ -                 'old boy':{}, +                 'Beihang University':{}, A             }, at             'Tin Tong Court':{}, -             'Huilongguan':{}, -         }, -         'Chaoyang':{}, -         'Dongcheng':{}, -     }, in     'Shanghai':{ -         'Minhang':{ to             "People's square":{ +                 'Fried Chicken Shop':{} -             } the         }, *         'Zhabei':{ $             'Train Warfare':{Panax Notoginseng                 'Ctrip':{} -             } the         }, +         'Pudong':{}, A     }, the     'Shandong':{}, + } -  $Exit_flag = True#set a pointer that jumps out of the entire loop $  -  whileExit_flag:#If you want to keep in this menu, you have to use the dead loop directly; -     #If there are several loops inside, then the existing knowledge can only set an outside variable to set the exit condition the      forIinchMenu#show the current level of content -         Print(i)Wuyi  theChoice1 = input ('Please enter the province, exit please enter Q') -  Wu     ifChoice1inchMenu: -         #This is the first floor of the province . About          whileExit_flag: $              forI2inchMenu[choice1]: -                 Print(I2) -Choice2 = input ('Please enter the area, B is the previous layer, Q is the exit') -             ifChoice2inchMenu[choice1]: A                 #This is the first floor of the district . +                  whileExit_flag: the                      fori3inchMenu[choice1][choice2]: -                         Print(i3) $Choice3 = input ('Please enter a location, B is the previous layer, Q is the exit') the                     ifChoice3inchMenu[choice1][choice2]: the                         #This is the bottom . the                          whileExit_flag: the                             ifi3inchMenu[choice1][choice2][choice3]: -                                 Print(i3) in                             Print("This is the last floor .") theChoice4 = input ('Select B, or Q') the                             ifChoice4 = ="b": About                                  Break the                             elifChoice4 = ="Q": theExit_flag =False the                                  Break         #here must remember break, so exit_flag can take effect, jump out of the entire cycle +                             Else: -                                 Print('your input was wrong.') the                                  Break               #You must remember to quit here .Bayi                     elifChoice3 = ="b": the                          Break the                     elifChoice3 = ="Q": -Exit_flag =False -                          Break  #here must remember break, so exit_flag can take effect, jump out of the entire cycle the                     Else: the                         Print('your input was wrong.') the                          Break  #You must remember to quit here . the             elifChoice2 = ="b":#elif can be used together so that multiple layers of nested if are avoided.  -                  Break the             elifChoice2 = ="Q": theExit_flag =False the                  Break  #here must remember break, so exit_flag can take effect, jump out of the entire cycle94             Else: the                 Print('your input was wrong.') the                  Break  #You must remember to quit here . the     elifChoice1 = ="b":98          Break About     elifChoice1 = ="Q": -Exit_flag =False101          Break  #here must remember break, so exit_flag can take effect, jump out of the entire cycle102     Else:103         Print('your input was wrong.')104          Break  #You must remember to quit here . the 106      Break

Written like this feeling is still quite low, the following more than 20 lines of code is copied.

Python program 3--level three menu program