三级菜单

data={"上海":{"徐汇":{"植物园":["梧桐","玉树"],
                  "华东理工":["足球场","研究生楼"]},
            "普陀":{"华师大":["毛主席像","志愿者群"],
                  "狮驼岭":["狮子","大象"]},
            "宝山":{"海边":["鱼","虾"],
                  "距离":["远","坐车"]}},
      "山东":{"菏泽":{"牡丹区":["牡丹园","家"],
                  "曹县":["学校","泪"],
                  "开发区":["高中","怀念"]},
            "济南":{"南方":["火","神鸟"]},
                  "北方":["风","电影"],
                  "东方":["云","龙"],
            "泰安":{"泰山":["高","俊山"],
                  "记忆":["大学","车站"],
                  "环境":["鸟语花香","干净"]}}
      }
print("即将进入三级菜单模式".center(100,"*"))
while True:
    for i in data:
        print('\t',i)
    choice1=input("请选择1》")
    if choice1 in data:
        while True:
            for i in data[choice1]:
                print('\t\t', i)
            chioce2=input("请选择2》")
            if chioce2 in data[choice1]:
                while True:
                    for i in data[choice1][chioce2]:
                        print('\t\t\t', i)
                    chioce3=input("请选择3》")
                    if chioce3 in data[choice1][chioce2]:
                        for i in data[choice1][chioce2][chioce3]:
                            print('\t\t\t\t',i)
                        print("已经不能再向下选择")
                        chioce4=input("如果想离开，请输入q；如果向返回上一级，请输入b》")
                        if chioce4=='q':
                            exit()
                        elif chioce4=='b':
                            pass
                    elif chioce3=='b':
                        break
                    else:
                        print("您输入的选项不存在，请重新选择》")
            elif chioce2=='b':
                break
            else:
                print("您输入的选项不存在，请重新选择》")
    elif choice1=='b':
        break
    else:
        print("您输入的选项不存在，请重新选择》")