day24 新三级菜单

 china = {
     "shandong":{
         "linyi":["lanshan","nanfang","hedong"],
         "liaocheng":["liaicheng1","liaicheng2","liaicheng3"],
         "qingdao":["qingdao1","qingdao2","qingdao3"]
     },
     "hubei":{
         "wuhan":["hongshan","wuchang","hanyang"],
         "suizhou":["suizhou1","suizhou2","suizhou3"],
         "huangshi":["huangshi1","huangshi2","huangshi3"]
     },
     "guangdong":{
         "guangzhou":["guangzhou1","guangzhou2","guangzhou3"],
         "dongguan":["dongguan1","dongguan2","dongguan3"],
         "shenzhen":["shenzhen1","shenzhen2","shenzhen3"]
     }
 }
 print('中国地图'.center(30,"-"))
 print(china["shandong"])

 # def threeLM(china):
 #     while True:
 #         for i in china:print(i)
 #         key = input("input>>>").strip()
 #         if    key == "b" or key == "q": return key        # 如果返回q就一直返回q，不断循序直到返回到最外面4
 #                                                         # 如果返回b就返回之前输入的key返回上一级
 #         elif key in china.keys() and china[key]:
 #             ret = threeLM(china[key])
 #             if ret == "q":return "q"
 #         elif (not china.get(key)) or (not china[key]) : continue

 l = [china]
 while l:
     for key    in l[-1]:print(key)
     k = input("input>>>").strip()
     if k in l[-1].keys() and l[-1][k]: l.append(l[-1][k])
     elif k == "b": l.pop()
     elif k == "q": break
     else: continue