Python job Two: Level three list

Job Two: Multilevel menu
Requirements:
1. Level Three Menu
2. You can choose to go to each submenu and return to the parent menu.
3. New knowledge points required: list, dictionary

Logic:

Print Provincial provincial selection whileinput_s = ="B": Print ProvincialElse: Judging provincial input and print city -level selection whileInput_c = ="B": Print ProvincialElse: Judge City-level input and print county-level selection whileinput_x = ="B": Print City levelElse: Judge County input print County number

Code implementation:

1 #Initializing System Tags2Input_s_flag = 0#provincial selection is correctly marked3Input_c_flag =04Input_x_flag =05input_s =""6Input_c =""7input_x =""8 9 #Initialize OutputTen Print("Provincial unit: Return to Superior: B") One Print(Dest.keys ())#Print Provincial Ainput_s = input ("Please select the provincial unit name:")#Provincial Selection -  -  whileInput_s.upper () = ="B":#Print Provincial the     Print("Provincial unit: Return to Superior: B") -     Print(Dest.keys ()) -input_s = input ("Please select the provincial unit name:") - Else:#Print City level +      forSsinchDest.keys ():#determine whether provincial selection is correct -         ifSS = =input_s: +Input_s_flag = 1 A              Break at     Else: -Input_s_flag =0 -      whileInput_s_flag = =0: -input_s = input ("input Error, please select the provincial unit name: \ n") -          forSsinchDest.keys ():#determine whether provincial selection is correct -             ifSS = =input_s: inInput_s_flag = 1 -                  Break to         Else: +Input_s_flag =0 -     ifInput_s_flag = = 1: the         Print("City-level units: Return to Superior: B") *         Print(Dest[input_s].keys ())#Print City level $Input_c = input ("Please select a city-level unit name:")#City-Level selectionPanax Notoginseng          whileInput_c.upper () = ="B": -             Print("Provincial unit: Return to Superior: B") the             Print(Dest.keys ()) +input_s = input ("Please select the provincial unit name:") A         Else: the              forCcinchDest[input_s].keys ():#determine whether the city-level selection is correct +                 ifCC = =Input_c: -Input_c_flag = 1 $                      Break $             Else: -Input_c_flag =0 -              whileInput_c_flag = =0: theInput_c = input ("wrong input, please select the city level unit name: \ n") -                  forCcinchDest.keys ():#determine whether the city-level selection is correctWuyi                     ifCC = =Input_c: theInput_c_flag = 1 -                          Break Wu                 Else: -Input_c_flag =0 About             ifInput_c_flag = = 1: $                 Print("County Unit: Return to Superior: B") -                 Print(Dest[input_s][input_c])#Print County -input_x = input ("Please select the county unit name:")#County Selection -                  whileInput_x.upper () = ="B": A                     Print("City-level units: Return to Superior: B") +                     Print(Dest[input_s].keys ())#Print City level theInput_c = input ("Please select a city-level unit name:")#City-Level selection -                 Else: $                      forXxinchDest[input_s][input_c]: the                         ifxx = =input_x: theInput_x_flag = 1 the                              Break the                     Else: -Input_x_flag =0 in                      whileInput_x_flag = =0: theinput_x = input ("input error, please select County-level unit name: \ n") the                          forXxinchDest[input_s][input_c]:#determine whether county-level selection is correct About                             ifxx = =input_x: theInput_x_flag = 1 the                                  Break the                         Else: +Input_x_flag =0 -                     ifInput_x_flag = = 1: the                         Print("The number of the%x you have selected is:"%input_x)Bayi                         Print("back to top level: B") the                         Print(Dest[input_s][input_c].index (%x)%input_x)

Python job Two: Level three list