This check recommends using Blueprint when there are too many route handlers in a single file. Blueprint encourages modularity and can greatly simplify how large applications work and provide a central means for Flask extensions to register operations on applications.
The check fires when there are more than 3 routes with the same prefix in a file. Definitions that are very long and the user does not seem to be using blueprints!
The check will detect these cases.
@app.route("/user") def user(): return @app.route("/user/a") def user_b(): return @app.route("/user/b") def user_b(): return