I've only had a BP for a few months but here's a few things I've learned:
Ball pythons are nocturnal and don't have eyelids, and it looks like you've got it out in daylight. So it's probably uncomfortable and would rather be inside its dark hide, sleeping. Try handling it in evening, with lower lighting.
You've only had it a few days! Pythons don't even generally like being around other pythons, and you're a huge warm-blooded alien to him. Go slow, handle it only for 5-10 minutes at a time for the first two or three weeks, give it some time to learn to trust you.
And while he's learning about you, you can be learning about him. One thing my BP taught me early on is that he doesn't like quick or sudden hand movements at all, even when not close to him. But now, moving hands almost in 'slow motion' I can pick him up, stroke his neck, and if I keep my fingers still he'll move forward and rub his head and chin on them, and while he's doing that I can 'pet' or stroke his head a little bit. But if I were to to just move my hand towards his head he'll still instinctively and quickly jerk it away.