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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.
For python, embedding the solution in a class is fairly pointless and somewhat annoying.
The python kata doesn't need the class. That's just weird in python.