记录：
遇到这种报错信息：
在create_all（）生成数据表的时候，添加app=app，指明app对象即可-----> create_all（app=app）
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No application found. Either work inside a view function or push an application context.
终极解决：No application found. Either work inside a view function or push an application context.
[flask初学问题]RuntimeError: No application found. Either work inside a view function or push an application context. See http://flask-sqlalchemy.pocoo.org/contexts/
flask中的上下文 RuntimeError: No application found . Either work inside a view function or push an application context
[FATAL_ERROR] Cannot start Maven: No valid Maven installation found. Either
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Application Context和单例模式
Matlab：fsolve No solution found.
开机No Boot Device Found.