'''

 Author:Ranxf

 '''

 menu = {

     '北京': {

         '海淀': {

             '五道口': {

                 'soho': {},

                 '网易': {},

                 'google': {}

             },

             '中关村': {

                 '爱奇艺': {},

                 '汽车之家': {},

                 'youku': {},

             },

             '上地': {

                 '百度': {},

             },

         },

         '昌平': {

             '沙河': {

                 '老男孩': {},

                 '北航': {},

             },

             '天通苑': {},

             '回龙观': {},

         },

         '朝阳': {},

         '东城': {},

     },

     '上海': {

         '闵行': {

             "人民广场": {

                 '炸鸡店': {}

             }

         },

         '闸北': {

             '火车战': {

                 '携程': {}

             }

         },

         '浦东': {},

     },

     '山东': {},

 }

 exit_flag = False

 while not exit_flag:

     for i1 in menu:

         print(i1)

     choice1 = input(">>>选择一级菜单1>>>: ")

     if choice1 in menu:

         while not exit_flag:

             for i2 in menu[choice1]:

                 print("\t", i2)

             choice2 = input(">>>选择二级菜单2>>>: ")

             if choice2 in menu[choice1]:

                 while not exit_flag:

                     for i3 in menu[choice1][choice2]:

                         print("\t\t", i3)

                     choice3 = input(">>>选择三级菜单3>>>: ")

                     if choice3 in menu[choice1][choice2]:

                         for i4 in menu[choice1][choice2][choice3]:

                             print("\t\t", i4)

                         choice4 = input(">>>最后一级菜单,按b返回，按q退出>>>: ")

                         if choice4 == 'b':

                             pass

                         elif choice1 == 'q':

                             exit_flag = True

                     if choice3 == 'b':

                         break

                     elif choice3 == 'q':

                         exit_flag = True

             if choice2 == 'b':

                 break

             elif choice2 == 'q':

                     exit_flag = True

     if choice1 == 'b':

         break

     elif choice1 == 'q':

         exit_flag = True