RuntimeError：working outside of application context. Flask使用SQLAlchemy数据库

问题

报错RuntimeError：working outside of application context.
 

本质：依赖包版本不匹配

flask-sqlalchemy、flask-sqlalchemy 版本过高导致，换低版本

pip install flask-sqlalchemy==2.5.1
pip install SQLALchemy==1.4.32

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