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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.
The description is very old and poor. Translations should've modified the description, but no one did...
Still, for python it's quite obvious when you look at initial code and sample tests: it expects a regular function.
As for the failing test, did you see which input fails? See https://docs.codewars.com/training/troubleshooting/#print-input