It's a great project! I use it to power the Python interpreter for an in-browser backend of an app I'm working on.

I wrote a bit more about my experience using it (and a guide for others) here: https://datastation.multiprocess.io/blog/2021-06-16-language....

My biggest gripe is that so far I haven't been able to get good stacktraces out of it on errors. It also wraps all objects in custom Brython types that you have to rewrap in Python types to do stuff like get `.keys()` on JavaScript objects.