Ah, here is something I really know. There is psychological phenomenon in which captive snakes will revert back to their wild behavior due to changes to their enclosure. The snake believes it has been released back into the wild, and will try to defend itself from people. After a while, your snake will get accustomed to you again. Now, I haven't had this happen to my ball pythons, but I have had my snakes get mites. When ball pythons have mites, they are easily irritables and will strike at you. You can look for mites by running your snake through your hands,and then look for tiny brown bugs crawling on your hands. Also look for raised scales all over the body. If your snakes have mights, their are special reptile mite and tick sprays you can buy at petshops. I think the kind I use is Mite Be Gone. Good luck with your pythons.