hey shnimpon..
your likely to get a few different answers as different people keep their pythons differently..
ok for hatchies you can use a small tub (click clack) with a heat matt under half of it..
for an adult... as a general rule the enclosure should be no less then half the lenght of the python in question.. and the width half that lenght again.. the height depends on if the python is arboreal or ground dwelling..
so a good size enclosure for a 2m coastal would be 100cm(L)x100cm(H)x50cm(W)
Megz