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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.
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My bad.
Wow, thats really cool; could you explain how that works?
Not that it really matters but "number = lambda lines" is not pep8 complaint, so some python devs might get annoyed.
http://stackoverflow.com/questions/25010167/e731-do-not-assign-a-lambda-expression-use-a-def