How should I dispute or disagree with a grade I received?

As a first step, please do reach out to your grader. Our best and recommended practice is to email your grader, and write in that email that you plan to speak with that person at the next office hours they hold, and point directly to the portion of the assignment that you want to discuss. We have a crackerjack staff, and they are not just here to stick numbers on your work, but also for discussion and constructive criticism. It can be instructive to have an informed conversation with someone who’s looked both at your code in particular and that of other students as well. This is often an excellent opportunity for that kind of discussion.

If you cannot make that person’s office hours, then you should try to find an alternate time to meet and have this discussion.

If, after this meeting you still have questions, then please forward me the email chain in which you have been communicating with your grader, with the upshot of your prior discussions.

Note that, when you dispute a grade, the graders reserve the right to either increase or decrease your grade, pick choose your battles wisely.