Python自动化开发学习之三级菜单制作

data = { "天津":{  "南开区":{   "南开大学":{    "历史系":{},    "文学系":{},    "英语系":{},   },   "科技大学":{    "计算机系":{},    "机器系":{},    "软件系":{},   },   "理工大学":{    "数学系":{},    "化学系":{},    "物理系":{},   },  },  "武清区":{   "武清大学":{    "历史系":{},    "文学系":{},    "英语系":{},   },   "武清科技大学":{    "计算机系":{},    "机器系":{},    "软件系":{},   },   "武清理工大学":{    "数学系":{},    "化学系":{},    "物理系":{},   },  },  "北辰区":{   "北辰大学":{    "历史系":{},    "文学系":{},    "英语系":{},   },   "北辰科技大学":{    "计算机系":{},    "机器系":{},    "软件系":{},   },   "北辰理工大学":{    "数学系":{},    "化学系":{},    "物理系":{},   },  }, }, "河北":{  "保定市": {   "保定大学": {    "历史系": {},    "文学系": {},    "英语系": {},   },   "保定科技大学": {    "计算机系": {},    "机器系": {},    "软件系": {},   },   "保定理工大学": {    "数学系": {},    "化学系": {},    "物理系": {},   },  },  "秦皇岛": {   "秦皇岛大学": {    "历史系": {},    "文学系": {},    "英语系": {},   },   "秦皇岛科技大学": {    "计算机系": {},    "机器系": {},    "软件系": {},   },   "秦皇岛理工大学": {    "数学系": {},    "化学系": {},    "物理系": {},   },  },  "石家庄": {   "石家庄大学": {    "历史系": {},    "文学系": {},    "英语系": {},   },   "石家庄科技大学": {    "计算机系": {},    "机器系": {},    "软件系": {},   },   "石家庄理工大学": {    "数学系": {},    "化学系": {},    "物理系": {},   },  }, }, "河南":{  "郑州市": {   "郑州大学": {    "历史系": {},    "文学系": {},    "英语系": {},   },   "郑州科技大学": {    "计算机系": {},    "机器系": {},    "软件系": {},   },   "郑州理工大学": {    "数学系": {},    "化学系": {},    "物理系": {},   },  },  "南阳市": {   "南阳大学": {    "历史系": {},    "文学系": {},    "英语系": {},   },   "南阳科技大学": {    "计算机系": {},    "机器系": {},    "软件系": {},   },   "南阳理工大学": {    "数学系": {},    "化学系": {},    "物理系": {},   },  },  "登封市": {   "登封大学": {    "历史系": {},    "文学系": {},    "英语系": {},   },   "登封科技大学": {    "计算机系": {},    "机器系": {},    "软件系": {},   },   "登封理工大学": {    "数学系": {},    "化学系": {},    "物理系": {},   },  }, },}#exit_flag = Falsewhile True: for i in data :  print (i) choice = input ("input:") if choice in data:  while True:   for i2 in data[choice]:    print (i2)   choice2 = input("input2:")   if choice2 in data[choice]:    while True:     for i3 in data[choice][choice2]:      print (i3)     choice3 = input("input3:")     if choice3 in data[choice][choice2]:      for i4 in data[choice][choice2][choice3]:       print(i4)      choice4 = input("Press b to return to the previous level:")      if choice4 == "b":       pass      elif choice4 == "q":       exit ()     if choice3 == "b":      break     elif choice3 == "q":      exit()   if choice2 == "b":    break   elif choice2 == "q":    exit()