So I don't keep ball pythons, but it looks like pied is recessive, and banana is incomplete dominant (what many people inaccurately call 'co-dominant').
Every offspring from a visual (homozygous) pied will be 100% het for pied; each of your offspring got one pied gene from the female parent.
Every offspring from a banana will be either banana (carrying the banana gene) or normal (not carrying the banana gene).
There is no 'het for banana', as banana is not a recessive trait.
Ball python people check my math please, though I think this is pretty straightforward.
