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我是python 3.7,windows10,在虚拟环境中通过flask run 启动web开发服务器时报错如下，请教各位高手，非常感谢！
(venv) PS D:\软件开发\python_git\flasky\venv> set flask_app=hello.py
(venv) PS D:\软件开发\python_git\flasky\venv> flask run
* Environment: production
WARNING: Do not use the development server in a production environment.
Use a production WSGI server instead.
* Debug mode: off
Usage: flask run [OPTI**]
Error: Could not locate a Flask application. You did not provide the "FLASK_APP" environment variable, and a "wsgi.py" or "app.py" module was not found in the current directory.
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