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#Author：Kevin_hou data ={     "中国":{         "上海": {             "浦东": {                 "曹路":{},                 "川沙":{},                 "唐镇":{},                 "张江":{},                 "金桥":{},                 "北蔡":{}             },             "黄埔":{},             "徐汇":{},             "静安":{}         },         "苏州":{             "吴江":{                 "松陵":{},                 "盛泽":{},                 "同里":{},             },             "姑苏":{},             "吴中":{},             "工业园":{}         },         "宿州":{             "砀山":{                 "西南门":{},                 "梁梨":{},                 "园艺场":{}             }         }     },     "日本":{},     "韩国":{},     "泰国":{}  }   exit_flag =False while not exit_flag:     for i in data:         print(i)     choice1 = input("进入第一级菜单>>>：")     if choice1 in data:         while not exit_flag:             for i1 in data[choice1]:                 print("\t",i1)             choice2 = input("进入第二级菜单>>>:")             if choice2 in data[choice1]:                 while not exit_flag:                     for i2 in data[choice1][choice2]:                         print("\t\t",i2)                     choice3 = input("进入第三级菜单>>>:")                     if choice3 in data[choice1][choice2]:                         while not exit_flag:                             for i3 in data[choice1][choice2][choice3]:                                 print("\t\t\t",i3)                             choice4 = input("进入最后一层，输入b返回上一层>>>:") #                            while not exit_flag: #                                print("\t\t\t\t",i4)                             if choice4 =="b":                                 break #                                pass                             elif choice4 =="q":                                 exit_flag =True                     if choice3 =="b":                         break                     elif choice3 =="q":                         exit_flag =True             if choice2 =="b":                 break             elif choice2 == "q":                 exit_flag =True