[edelans]

Like others wrote here, first thing to do is probably to narrow down the python skills he needs to practice (web ? data science ? ... ).

But as we are about to get in December, if he wants to practice general python skills in a fun way, I'd recommend having a look at the advent of code (https://adventofcode.com/2021).

Solving the problems on your own provides only a fraction of the learning opportunity, though. To capture it all, you need to read others' solutions on the related sub reddit. There are a few people out there documenting their solutions super effectively. Last year, for instance, I learned a lot from https://github.com/mebeim/aoc/tree/master/2020