We're evaluating various RPC frameworks here at Patreon, and I suggested we look into Twirp since it seemed to have the ability to generate Python servers (we're a Python shop).
Specifically, the line (in README.md) This repo only has the official generators, which write out Go and Python code, while not specifically stating that Python servers are generated, also doesn't completely rule it out.
To prevent disambiguity, this might be something you want to add to the table, as well as reformatting to This repo only has the official generators for Go (client & server) and Python (client)