Debian is my Linux distro of choice. I first started using it sometime around 2003, but switched to Ubuntu for several years because I became frustrated with the age of the packages in it’s repository. Going back to Debian has made me appreciate it much more than I did before, several years of fixed versions with security updates means that I can write software and mostly forget about it until the next release.
The Decimal class in the standard library is the way to avoid double precision errors in Python.