They poop when they need to. You can keep a record book, write things on a little card you keep attached to the tank or even use a program like www.degei.com if you want to. Weekly feeding of any appropriate sized prey is best. Ball pythons are creatures of habit and they do well with routine. BP's will pass urates (dry chalky whitish lumps) or liquid urine and their poop pretty much looks like what cats do. Congrats on your successful feeding!