[LAD] prototyping callback based architecture in python?

Hi, I'm working on an a project that I intend to do using the STK in a callback style, but am hoping I can prototype the architecture in python until I've figured out the various components and their responsibilities and dependencies. Does anyone know of any kind of python library ( or method? ) that would let me simulate the way callback based STK apps using RTAudio work? IE I want to have a python master callable that gets called once per audio sample and has a way of sending out it's results to the audio subsystem. I've found a bunch of python audio libs but it doesn't seem like they work that way, maybe I'm missing something? thanks! Iain