I've never really heard of peat moss as bedding for ball pythons. However, I've heard of it used for humidity hides. I use a mixture of coconut fiber and fir bark shavings for my ball python, works great so far. Good for spot cleaning and keeps in humidity, you can also grow plants in it.

I did use coconut fiber only at one point, I actually forget why I decided to mix fir bark and coconut fiber... OH, I just had a brain blast. It was because the coconut fiber was getting all over my room and it was kind of annoying, so by using fir bark it's kind of less of a mess.

I've never used cypress mulch, sounds like I'll try it eventually.