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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.
In fact, no. I tested it and everything went fine.
However, I later edited it but in the editor the language version dropdown was gone. Hence an error when trying to run it "Invalid python version ''". So the failure is actually a Codewars bug, the script did not even run.
Could you please try to run it, if the language option is available on your side ?
Or you can manually review/test it.