这篇博客记录了在尝试运行Flask应用时遇到的环境问题。错误提示表明这是一个开发服务器，不适用于生产环境，并且未设置'FLASK_APP'环境变量或找不到'app.py'文件。解决方案是切换到不同的终端，最终成功运行。对于开发者来说，正确配置开发环境和理解错误信息至关重要。
刚开始反复报错，显示
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: off
Usage: flask run [OPTIONS]
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.
最后找到问题，是终端问题
可以将终端换一下试试看
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