Python's third-level menu

#author:zhouyuarea = {     ' Guangdong ':{         ' Jieyang ':{             ' puning ':{                  ' Lake ',                  ' Plum Pond ',                  ' Quicksand '                      },              ' Hongyang ': {' 1 ', ' 2 '},              ' Jiexi ': {' 1 ', ' 2 '}},         ' Shenzhen ': {' 1 ', ' 2 '},          ' Guangzhou ': {' 1 ', ' 2 '}             },     ' Beijing ': {' 1 ', ' 2 '},     ' Sichuan ': {' 1 ', ' 2 '}} #先进入循环while  true: #打印出省份      for i in area:        print (i) #让用户选择省份     choose = input ("Please select Province:") #判断用户输入的省份在字典里面存在与否. The presence is down execute   not return # here to note, Choose in area means that the user input of the area is not present in the #area dictionary, if not exist to see if the user input is q, if the Q is to exit     if choose in area: #如果If判断是True的话, that should go into a cycle, but also constantly choose the city, #所以下面一定要是一个循环         while true: #打印出城市              for i2 in area[choose]:                 print (i2) #让用户输入城市              choose1 = input ("Please select City:") #判断用户输入的城市存不存在我们的列表中, if present, enter a loop , #如果不存在就看看用户输入的是否为q, if Q is the exit, if B is the return # The following explanation is the same   don't say it allSolution, if there is no understanding can add me:1090139534            if  choose1 in area[choose]:                 while True:                     for i3 in area[choose][choose1]:                          print (i3)                      choose2 = input ("Please select County:")                      if  choose2 in area[choose][choose1]:                         for i4 in area[choose][choose1][choose2]:                              print (I4)                          while  true:                             choose3 = input ("input ' B ' can return: ")                              if choose3 ==  ' B ':                                  break                     elif choose2 == ' Q ':                          exit ("Thankyou for use")                      elif choose2 == ' B ':                          break            elif  choose1 ==  ' Q ':                 exit ("Thankyou for use")              elif choose1 ==  ' B ':                 break    elif choose ==  ' Q ':         exit ("Thank you foruse")

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Python's third-level menu