I use python at work but code these in kotlin. The stdlib for lists is very comprehensive, and the syntax is sweet. So easy to make a chain of map, filter and some reduction or nice util (foldr, zipwithnext, windowed etc). Flows very well with my thought process, where in python I feel list comprehensions are the wrong order, lambdas are weak etc.

I write most as pure functional/immutable code unless a problem calls for speed. And with extension functions I've made over the years and a small library (like 2d vectors or grid utils) it's quite nice to work with. Like, if I have a 2D list (List<List<E>>), and my 2d vec, like a = IntVec(5,3), I can do myList[a] and get the element due to an operator overload extension on list-lists.

and with my own utils and extension functions added over years of competitive programming (like it's very fluent