Welcome to BP.net! Good to have you here!
To be honest, yourball pythons has a brain about the size of a smallish black eyed pea. It's not really equipped to be either happy or unhappy as you and I measure those emotions.
With ball pythons, we try to judge their stress level based on their actions. Ball pythons that eat, poop, pee, and shed, are generally not too stressed.
Ball pythons that don't do all of the above well, are usually overly stressed by something like poor husbandry, too much handling or too many rides around someone's neck.