secret key not set in flask session, using the Flask-Session extension

Question

Right now I am using a flask 3rd party library Flask-Session and I am having no luck getting a session working.

When I connect to my site, I get the following error:

Answer 1

Set the secret key outside of if __name__ == '__main__':

app.py:

from flask import Flask, session

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

@app.route("/")
...

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

When you start your app by running flask run the if __name__ == '__main__': block gets skipped. If you don't want to skip it, run with python app.py.