I mostly use pandas that I don’t think is going anywhere, we’re also going to start tests with a library called ‘chainladder’ that is used for some actuarial reserves calculations, from everything else I’m programming custom functions because as far as I know, there’s not a lot of actuarial mathematics libraries on Python (R have much more support for that, but I prefer the flexibility of Python, like a good portion of my job is scrapping our regulatory body website for information and not sure how good R work on that).