I made some improvements to the Python client. I implemented fetch, multi-fetch, multi-produce, and offset requests; I also documented each request/response with the wire format. I've committed to my Kafka branch on GitHub. I have only briefly tested things.
https://github.com/mumrah/kafka/tree/trunk/clients/python It's mostly low-level protocol stuff. I'm sure there is room for some more helper methods and high-level API. Feedback is welcome! -David