zone = {
    "广东":{ "广州":{ "天河":["天河体育馆","暨南大学"],
                        "越秀":["越秀公园","五羊"]
                  },
              "深圳":{ "福田":["市民中心","平安大厦"],
                        "南山":["腾讯","世界之窗"]
                  }
            },
    "湖北":{ "武汉":{ "武昌":["武汉大学","华科大"],
                        "汉口":["汉正街","火车站"]
                  },
              "鄂州":{ "鄂城":["武商","西山"],
                        "葛店":["开发区","电厂"]
                  }
            }
}
exit_flag = False
while not exit_flag:
    for i in zone:
        print(i)
    choice = input("请选择：")
    if choice in zone :
        while not exit_flag:
            for i2 in zone[choice]:
                print(i2)
            choice2 = input("请选择2：")
            if choice2 in zone[choice]:
                while not exit_flag:
                    for i3 in zone[choice][choice2]:
                        print(i3)
                    choice3 = input("请选择3：")
                    if choice3 in zone[choice][choice2]:
                        for i4 in zone[choice][choice2][choice3]:
                            print(i4)
                        choice4 = input("最后一级，请按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
    elif choice == "q" :
        break

python day-2 三级目录作业