login_user = relationship('LoginUser',backref=backref('user',uselist=False))

老师您能详细解释一下两个backref都是什么意思吗，这块不理解

还有为什么

user = relationship('User',uselist=False)

在LoginUser中设置后在，在user.login_user查询的时候返回的也不是列表

老师请问为什么我这里会找不到wtform模块？（已经安装好了，再次安装后会告诉我requirement already satisfied）

老师报错

PS C:\Users\29768\Desktop\SQLAICHEMY> & C:/Users/29768/AppData/Local/Programs/Python/Python311/python.exe c:/Users/29768/Desktop/SQLAICHEMY/FLASK_DEMO25/app.py

Traceback (most recent call last):

  File "c:\Users\29768\Desktop\SQLAICHEMY\FLASK_DEMO25\app.py", line 14, in <module>

    from user import user_bp

  File "c:\Users\29768\Desktop\SQLAICHEMY\FLASK_DEMO25\user\__init__.py", line 5, in <module>

    from user import view

  File "c:\Users\29768\Desktop\SQLAICHEMY\FLASK_DEMO25\user\view.py", line 25, in <module>

    user_bp.add_url_rule('/login/',view_func=LoginView.as_view('login'))

  File "C:\Users\29768\AppData\Local\Programs\Python\Python311\Lib\site-packages\flask\sansio\scaffold.py", line 46, in wrapper_func

    self._check_setup_finished(f_name)

  File "C:\Users\29768\AppData\Local\Programs\Python\Python311\Lib\site-packages\flask\sansio\blueprints.py", line 215, in _check_setup_finished       

    raise AssertionError(

AssertionError: The setup method 'add_url_rule' can no longer be called on the blueprint 'user'. It has already been registered at least once, any changes will not be applied consistently.

Make sure all imports, decorators, functions, etc. needed to set up the blueprint are done before registering it.

老师出现这个是什么情况

老师  这个报错是？

老师我点击加号创建新数据库后是这样 和视频不一样 然后我怎么弄才能继续创建新数据库

老师，报了一堆错

为啥写全了路径也显示这个

RuntimeError: The environment variable 'flask_setting' is not set and as such configuration could not be loaded. Set this variable and make it point to 

a configuration file

的错误呀，老师

我要学全栈开发，web前后端都学

老师我这个是版本的问题嘛，或者说是老师使用的是那个版本的

老师，安装的是哪个插件呢，第一个跟您视频里面创建过程不一样