Behavior Question

Every time I enter the room my ball python peeks his head out of his hide, whichever one he's in, and sort of sees what I'm up to. He was doing this every day so I figured he was still hungry after having only eaten 3 days before, so I fed him again yesterday and he took the food. Now today he's doing the same thing, is it possible he is still hungry? He had a rat pup because he's still pretty young and that was the appropriate size food item.

Otherwise is he just that curious that he has to check out what I'm doing?

It could just be curiosity, he could be hungry even though he does not need to eat. Some snakes will eat themselves to death if you let them (just like any other living animal), some are just more interested in their surroundings. Granted certain species have a generally excepted demeanor, they are still individuals. Just be glad you get to see yours. Ours are exactly the opposite. If their heads are out of their hide and they see movement, they usually retreat back in and out of sight. Our womas on the other hand are exactly the opposite. I have never seen a species so inquisitive.
Also, keep in mind in the wild they are opportunistic hunters. If they waited 7 days to eat, they may miss an opportunity and have to wait even longer.

It's probably curiosity. Entering the room is likely noticable to the snake and it's attempting to see what's going on.

It could also be supersticious behavior due to intermittant reinforcement. By sticking its head out, it gets food. Sometimes it works, ergo it must stick its head out to get food. They aren't super smart, but psychological conditioning can still affect it.