These are my solutions for the puzzles from Advent of Code 2018.
They are written for Python 3.7 and, since they use features introduced in that version, no lower. Some solutions depend on NumPy for performance and occasionally convenience.
In my code, I try to strike a balance between clarity, brevity, and efficiency. It might be worth mentioning that these are not the same solutions I use when submitting my answers; those are a lot messier, but the general approach usually remains the same. Notes can be found here.