Views Templates Static Files Blog Blueprint Make the Project Installable Test Coverage Deploy to Production Keep Developing! Templates Jinja Setup Standard Context Standard Filters Controlling Autoescaping Configuration Basics Environment and Debug Features Builtin Configuration Values Configuring from Files Configuring from Environment Variables Configuration Best Practices Development / Production Instance Folders Application Discovery Run the Development Server Open a Shell Environments Debug Mode Environment Variables From dotenv Environment Variables From virtualenv Custom Commands Plugins Custom Scripts PyCharm Integration

running, you’ll find a variety of extensions available in the community to integrate your project for production. The Flask core team reviews extensions and ensures approved extensions do not break with future It is preferred for JSON operations if it is installed. • python-dotenv enables support for Environment Variables From dotenv when running flask commands. • Watchdog provides a faster, more efficient Virtual environments Use a virtual environment to manage the dependencies for your project, both in development and in production. What problem does a virtual environment solve? The more Python projects

flask run * Serving Flask app "app.py" * Environment: production WARNING: Do not use the development server in a production env ironment. Use a production WSGI server instead. * Debug mode: off FLASK_APP 和 FLASK_ENV 。因为我们的程序现在的名字是 app.py，暂时不需要设置 FLASK_APP ； FLASK_ENV 用来设置程序运行的环境，默认为 production 。 在开发时，我们需要开启调试模式（debug mode）。调试模式可以通过将系统环 境变量 FLASK_ENV 设为 development 来开启。调试模式开启后，当程序出

http://127.0.0.1:5000/ * Restarting with reloader Warning Debug mode should never be used in a production environment! Now open up a new prompt to test out your API using curl $ curl http://127.0.0.1:5000/

http://127.0.0.1:5000/ * Restarting with reloader Warning: Debug mode should never be used in a production environment! Now open up a new prompt to test out your API using curl $ curl http://127.0.0.1:5000/

http://127.0.0.1:5000/ * Restarting with reloader Warning: Debug mode should never be used in a production environment! Now open up a new prompt to test out your API using curl $ curl http://127.0.0.1:5000/

http://127.0.0.1:5000/ * Restarting with reloader Warning Debug mode should never be used in a production environment! Now open up a new prompt to test out your API using curl $ curl http://127.0.0.1:5000/

http://127.0.0.1:5000/ * Restarting with reloader Warning: Debug mode should never be used in a production environment! Now open up a new prompt to test out your API using curl $ curl http://127.0.0.1:5000/

http://127.0.0.1:5000/ * Restarting with reloader Warning: Debug mode should never be used in a production environment! Now open up a new prompt to test out your API using curl $ curl http://127.0.0.1:5000/

http://127.0.0.1:5000/ * Restarting with reloader Warning Debug mode should never be used in a production environment! Now open up a new prompt to test out your API using curl $ curl http://127.0.0.1:5000/