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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.
as long as nobody answered to your comment, you should be able to remove it. => Try for the one below. ;)
about your problem: I believe the kata is uncompletable for now in python because of a runner issue (edit: see the thread just below yours)