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if not current_user.is_authenticated:ista poistettu kahdesta kohtaa sulut perästä, koska kyseessä ei ole enää funktio vaan boolean uudessa Flaskissa https://stackoverflow.com/questions/32750526/flask-login-raises-typeerror-bool-object-is-not-callable-when-trying-to-overr ja https://stackoverflow.com/questions/33062109/typeerror-bool-object-is-not-callable-g-user-is-authenticated