I have a M/F pair of Bredli Pythons, about 7' each. They both climb a lot. Almost every night, after their lights go off, they are up on some bamboo I have across their cages. I have 3 pieces of about 2 - 2.5 inch bamboo in each, creating sort of a shelf, although there is a little space between them. In addition, I keep the door between the cages open, and they constantly are climbing between the upper and lower halves (it's about 80" high x 48" x 24", split in half). At any given time either one can be in either.

Jeff