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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I've just tried again the top voted solution, it passed the attempt tests in ≃ 1.5 seconds. My original solution in Python passes in ≃ 0.5 seconds. No idea what's going on here.
The top voted solution fails because of recursion error (not too slow). I don't know what should be done, there must have been at some moment an update in the tests or the framework that explains this change. 4 months ago it was not the case, and no change appears in the history of versions for Python.