Answer 1

There are many libraries out there that help with these topics. Most prominently: numpy, pandas and matplotlib. And there are even more if you venture into Machine Learning territory. It's often a matter of personal taste and depending on the specific problem, which library is best to use.
You can even learn and practice some of them in Sololearn courses.

A few options listed here:
https://code.sololearn.com/WA8a20A13a3A/?ref=app
https://code.sololearn.com/WcBwZLpyW3H4/?ref=app