In the README.md of the python subtree there's this sentence:
To learn more about TypeChat, visit the documentation which includes more information on TypeChat and how to get started.
However, the docs found at that link are exclusively aimed at a TypeScript audience, and give no specifics about e.g. how to write a schema in Python. I had to glean that from the examples, which is far from ideal. I had hoped for something like a Python version of Basic TypeScript Usage.