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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.
This confused me to at first, but I don't think its a typo; rather, they are saying 12 is the result of 21-9.
This solution works for python 3.6, since they added additional unpacking generalizations in 3.5. https://www.python.org/dev/peps/pep-0448/
I think the test cases in python should include Test.assert_equals(hero(0, 0), True) because some of the solutions posted would return that as False.