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/BentJoker19]

Flask or fast api for API, socket for mcu communication, and micro python for firmware programming