True indian pythons are pretty rare in captivity and it can be difficult to tell true indians from burms, and it is even harder to tell indian x burmese crosses apart from either species, which is a particular problem for those interested in them.
Indians from what I understand are smaller than burmese pythons, but still have the potential to get very big. I've read reports claiming up to 15 feet, but most people seem to quote an adult length of ~10 feet.. and of course they are built heavily just like their cousins, the burmese pythons.
Hopefully someone with more experience than me will chime in.