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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.
I think that Python version is unfairly more complicated than JS and Ruby versions because of this ".each" functionality (though it is possible to do).
It would have been much easier to pass lambda/function in the same way as in JS/Ruby version.