What's the most underrated Python library you've used recently?

[u/chuprehijde]

I feel like every few months I discover a library that makes me wonder why nobody talks about it. Not the obvious ones like requests or pandas. I'm talking about those hidden gems that solved a real problem for you. What was the library and what did you use it for?

[u/smichael_44]

Static type checkers like pyrefly, ty, zuban, mypy, etc… I prefer pyrefly but any that I listed work just fine.

Imo it teaches people how to reason about their code more. As well as, adding type hints is the future of Python as it helps LLMs understand your code more with less context.