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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.
Yes, but kata solutions don't necessarily have to be efficient (unless the kata tests explicitly require them to be such).
Maybe because there aren't arrow functions in Python and it was the most similar?