Complicated libraries can be a pain in the butt to use. It's not surprising that there are a lot of "X for humans" libraries out there, some of which are mostly wrappers around more frustrating interfaces.
This is not a theoretical talk. I'll touch upon theory to give you context, but will then talk about what that means for you in practice so that you can write better libraries. I'll talk about why library UX matters, about abstraction as a general concept, about out what happens when you over/under abstract, and about some useful tips to help build friendly APIs. Meanwhile, I'll show some positive examples from libraries we know and love (flask, SQLAlchemy, Requests, etc). Once you recognize these effects in play, you'll be able to apply them to your own code and make life better for everyone!