Not a channel, but talks by David Beazley on Python topics are gems. High insight density. The presentation are often 60+ pages, and you can spend hours playing with each concept in every 'slide'. His talks are rabbit holes.

Raymond Hettinger tweets snippets of code that are delicious. His talks are really useful, too. Specifically, the one entitled 'Beyond PEP8' which focuses you on the impact you can have by zooming out of details and concentrate on good design.

This is something I've been using. I write code that uses a yet to be API, and ask myself and colleagues if it makes sense for them to use it.

For example, I'm writing a Python wrapper for MinIO's admin command line interfaces 'mc' and 'minio' which the Python client lacks. Put up the docs first at https://big-mama-tech.gitlab.io/bmc and asked colleagues and the MinIO folks if it's acceptable/useful before really going for parity.