You'd be surprised about ball pythons, the ones at my local reptile store have perches available and they constantly make use of them. The only reason I don't offer it to my spider is becausee her wobbles make her a horrible treeclimber. Somebody said it's been done once, I assume it's a challenge but possible if you can get an eager male chondro with a female ball.
-----
1.0 speckled kingsnake
1.0 leucistic texas ratsnake
0.1 tricolor hognose
0.1 water python
0.1 spider ball python
1.0 green tree python