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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.
@Azuaron - agreed. The simplest python solution isn't possible because of the presence of a None value (as far as I can tell at least).
Funny, I was thinking the whole kata was very un-pythonic.