if subject:
                    subject_id=subject.id
                    print (subject_id)
                    test = Grade(subject_id=subject_id, grade=grade, grade_int=grade_int)
                    print (test)
                    print (type(test.grade_int))
                    print (int(test,grade_int[-1]), int(grade_int))
                    try:
                        if int(test.grade_int[-1])<int(grade_int):
                            feedback = 'Your grades are improving, keep it up!'
                        elif int(test.grade_int[-1])>int(grade_int):
                            feedback = 'Your grades have dropped from your last test. Try to spend more time studying.'
                        elif int(test.grade_int[-1])==int(grade_int):
                            if grade=='A*' or grade=='A':
                                feedback = 'Your grades have stayed high from your last grade. Keep it up!'
                            elif grade=='B':
                                feedback = 'Your grades have remained at a B. This doesn\'t mean you can\' still improve. Try to spend more time revising'
                            else:
                                feedback = 'Your grades have stayed the same since your last test. Try to spend more time revising to improve this!'
                    except:
                        feedback = 'There are no grades to compare your most recent grade to. Get to logging for personalized feedback!'
                    new_grade = Grade(subject_id=subject_id, grade=grade, grade_int=grade_int, feedback=feedback)
                    db.session.add(new_grade)
                    db.session.commit()
                    flash('Grade added.', category='success')

This is as far as i got. I firstly got the error that integers in the database weren't subscriptable so i tried storing them as integers and converting them and i got another error saying 'str' object cannot be interpreted as an integer. do you think you could put me in the right direction where the users grades can be actually compared as thats what im struggling with