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#小程序 递归 # def digui(n): #     print(n) #     if int(n/2)==0: #         return n #     else: #         return digui(int(n/2)) # digui(10) # # #进度条 # import sys,time # for i in range(20): #     sys.stdout.write("#") #     sys.stdout.flush() #     time.sleep(0.2) #3G菜单 data = {
   '北京':{
           "昌平":{
               "沙河":["oldboy","test"],             "天通苑":["链家地产","我爱我家"]         },         "朝阳":{
               "望京":["奔驰","陌陌"],             "国贸":{"CICC","HP"},             "东直门":{"Advent","飞信"}         },         "海淀":{
           },     }, '山东':{
           "德州":{},         "青岛":{},         "济南":{}     }, '广东':{
           "东莞":{},         "常熟":{},         "佛山":{}     }, } exit_flag = False while not exit_flag:     for i in data:         print(i)     choice = input("选择进入省份>>:")     if choice in data:         while not exit_flag:             for i2 in data[choice]:                 print("\t",i2)             choice2 = input("选择进入城市>>:")             if choice2 in data[choice]:                 while not exit_flag:                     for i3 in data[choice][choice2]:                         print("\t\t",i3)                     choice3 = input("选择进入县区>>:")                     if choice3 in data[choice][choice2]:                         for i4 in data[choice][choice2][choice3]:                             print("\t\t",i4)                         choice4 = input("最后一层，按b返回>>:")                         if choice4 == "b":                             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