How to use an authentication decorator from within a blueprint in flask

python flask flask-peewee

As you've noted, I think the problem is your module organization. What if you create a decorators module that contains requires_auth?

Then you will structure your imports to flow like:

app.py (instantiate app & db)
auth.py (instantiate auth, imports from app.py)
api.py (instantiate api, imports from app.py)
decorators.py (define requires_auth, imports from auth and api)
blueprints/views.py (imports from app.py, auth.py, api.py, decorators.py)
main.py (imports app, auth, api, decorators, blueprints) and is entry-point for application.

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