yes, the idea is to do these tasks using a variety of languages, not just Python. With this LZW task, for example, she has already created a compression and decompression in Python and is now working on doing it in C so that it can take a file compressed by a python script and decompress it back with C program.

Regarding Racket, it looks interesting. While I never did anything like it myself back in the day, it looks like it'll be an interesting task for my daughter further down the road.