Web Reference: Use an environment variable to switch between the configurations. This can be done from outside the Python interpreter and makes development and deployment much easier because you can quickly and easily switch between different configs without having to touch the code at all. Mar 9, 2026 · Having trouble with FLASK_APP? Learn how to configure environment variables with .flaskenv and .env in Flask. Automate your development, production, and testing environments. Jun 11, 2019 · It is for your .env file to be translated into actual env variables. So if you're going to have actual env variables without it, your os.getenv should still work.
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