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How to fix secret key not set in Python Flask session, using the Flask-Session extension?

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Sometimes, we want to fix secret key not set in Python Flask session, using the Flask-Session extension.

In this article, we’ll look at how to fix secret key not set in Python Flask session, using the Flask-Session extension.

How to fix secret key not set in Python Flask session, using the Flask-Session extension?

To fix secret key not set in Python Flask session, using the Flask-Session extension, we set it outside of the if __name__ == '__main__' block.

For instance, we write

from flask import Flask, session

app = Flask(__name__)
app.secret_key = "super secret key"

# ...

if __name__ == "__main__":
    app.debug = True
    app.run()

to set the app.secret_key property before we call app.run in the if __name__ == "__main__" block.

This is because flask run skips the if __name__ == "__main__" block.

We can run python app.py to start the app if we want to run the if __name__ == "__main__" block.

Conclusion

To fix secret key not set in Python Flask session, using the Flask-Session extension, we set it outside of the if __name__ == '__main__' block.

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