I have a PVC enclosure that helps me greatly to retain heat and better control temps. I use under tank heating to control the surface temp inside the warm hide and a radiant heat panel to help with ambient temps and cool side temps. The walls of the enclosure and areas the heat does not radiate to is nothing I concern myself due to the insulating properties of the PVC
You should be fine so long as the ground temps are near what your ball python needs. Thankfully they are not arboreal snakes.
If you are having problems keeping temps under control you can insulate the walls and floor of the glass tank to better control heat loss. If CHEs are not cutting it you can get a radiant heat panel from Cornel's World (ships them in Canada) and find videos online on ways to secure one to the screen top.
You will never be able to control heat as well in a glass tank as you can with PVC unless you heat the room the tank is in.
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