Is there a good library out there in Python that provides a simple abstraction over the major LLM providers, such that it's easy for me to swap out which one I'm using for a given project?

I find myself writing my own version of this because each of the LLMs have strengths and weaknesses, and sometimes for a project I want to test them all out before committing to use a specific one.

A few months back I looked at @simon's `llm`, but from what I could tell it was mostly wrapping ChatGPT or compatible APIs, and I wasn't sure how to use it for everything.