I'd never give anyone new to this hobby the advice to keep two ball pythons in the same enclosure. My question would be why would you be thinking of doing it? Is it because you want to save money housing them because you cant afford a new tank? If that's it then don't buy a new snake until you can afford to house two snakes. If its due to space issues same thing applies and wait until you have the space. If its because you think they need a companion that is not the case with ball pythons.
I struggle to even think of one reason to put them both in the same enclosure other than to breed.