Top Python libraries of 2021 you should know about

Welcome to a new edition (7th!) of our yearly Top Python Libraries list! Starting in December 2015 -- and uninterruptedly since then -- we have been compiling the best Python libraries that are launched or popularized every year (or late the previous year). It all started as a "Top 10" series, but although we still have 10 main picks, we are nowadays listing so many more libraries. The work the Python community has been doing is just too good, and we want to give YOU a chance to find these great libraries in case they haven't yet crossed your path. In case you are not a fan of most top-10-style posts, bear with us and give this a chance.