1 data =http://www.mamicode.com/ {
  2     "天津":{
  3         "南开区":{
  4             "南开大学":{
  5                 "历史系":{},
  6                 "文学系":{},
  7                 "英语系":{},
  8             },
  9             "科技大学":{
 10                 "计算机系":{},
 11                 "机器系":{},
 12                 "软件系":{},
 13             },
 14             "理工大学":{
 15                 "数学系":{},
 16                 "化学系":{},
 17                 "物理系":{},
 18             },
 19         },
 20         "武清区":{
 21             "武清大学":{
 22                 "历史系":{},
 23                 "文学系":{},
 24                 "英语系":{},
 25             },
 26             "武清科技大学":{
 27                 "计算机系":{},
 28                 "机器系":{},
 29                 "软件系":{},
 30             },
 31             "武清理工大学":{
 32                 "数学系":{},
 33                 "化学系":{},
 34                 "物理系":{},
 35             },
 36         },
 37         "北辰区":{
 38             "北辰大学":{
 39                 "历史系":{},
 40                 "文学系":{},
 41                 "英语系":{},
 42             },
 43             "北辰科技大学":{
 44                 "计算机系":{},
 45                 "机器系":{},
 46                 "软件系":{},
 47             },
 48             "北辰理工大学":{
 49                 "数学系":{},
 50                 "化学系":{},
 51                 "物理系":{},
 52             },
 53         },
 54     },
 55     "河北":{
 56         "保定市": {
 57             "保定大学": {
 58                 "历史系": {},
 59                 "文学系": {},
 60                 "英语系": {},
 61             },
 62             "保定科技大学": {
 63                 "计算机系": {},
 64                 "机器系": {},
 65                 "软件系": {},
 66             },
 67             "保定理工大学": {
 68                 "数学系": {},
 69                 "化学系": {},
 70                 "物理系": {},
 71             },
 72         },
 73         "秦皇岛": {
 74             "秦皇岛大学": {
 75                 "历史系": {},
 76                 "文学系": {},
 77                 "英语系": {},
 78             },
 79             "秦皇岛科技大学": {
 80                 "计算机系": {},
 81                 "机器系": {},
 82                 "软件系": {},
 83             },
 84             "秦皇岛理工大学": {
 85                 "数学系": {},
 86                 "化学系": {},
 87                 "物理系": {},
 88             },
 89         },
 90         "石家庄": {
 91             "石家庄大学": {
 92                 "历史系": {},
 93                 "文学系": {},
 94                 "英语系": {},
 95             },
 96             "石家庄科技大学": {
 97                 "计算机系": {},
 98                 "机器系": {},
 99                 "软件系": {},
100             },
101             "石家庄理工大学": {
102                 "数学系": {},
103                 "化学系": {},
104                 "物理系": {},
105             },
106         },
107     },
108     "河南":{
109         "郑州市": {
110             "郑州大学": {
111                 "历史系": {},
112                 "文学系": {},
113                 "英语系": {},
114             },
115             "郑州科技大学": {
116                 "计算机系": {},
117                 "机器系": {},
118                 "软件系": {},
119             },
120             "郑州理工大学": {
121                 "数学系": {},
122                 "化学系": {},
123                 "物理系": {},
124             },
125         },
126         "南阳市": {
127             "南阳大学": {
128                 "历史系": {},
129                 "文学系": {},
130                 "英语系": {},
131             },
132             "南阳科技大学": {
133                 "计算机系": {},
134                 "机器系": {},
135                 "软件系": {},
136             },
137             "南阳理工大学": {
138                 "数学系": {},
139                 "化学系": {},
140                 "物理系": {},
141             },
142         },
143         "登封市": {
144             "登封大学": {
145                 "历史系": {},
146                 "文学系": {},
147                 "英语系": {},
148             },
149             "登封科技大学": {
150                 "计算机系": {},
151                 "机器系": {},
152                 "软件系": {},
153             },
154             "登封理工大学": {
155                 "数学系": {},
156                 "化学系": {},
157                 "物理系": {},
158             },
159         },
160     },
161 }
162 #exit_flag = False
163 while True:
164     for i in data :
165         print (i)
166     choice = input ("input:")
167     if choice in data:
168         while True:
169             for i2 in data[choice]:
170                 print (i2)
171             choice2 = input("input2:")
172             if choice2 in data[choice]:
173                 while True:
174                     for i3 in data[choice][choice2]:
175                         print (i3)
176                     choice3 = input("input3:")
177                     if choice3 in data[choice][choice2]:
178                         for i4 in data[choice][choice2][choice3]:
179                             print(i4)
180                         choice4 = input("Press b to return to the previous level:")
181                         if choice4 == "b":
182                             pass
183                         elif choice4 == "q":
184                             exit ()
185                     if choice3 == "b":
186                         break
187                     elif choice3 == "q":
188                         exit()
189             if choice2 == "b":
190                 break
191             elif choice2 == "q":
192                 exit()