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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.
The task is not clear. And my comment doesn't spoil the solution, but clears the request.
This comment is hidden because it contains spoiler information about the solution
IMHO it breaks the 3rd zen rule of Python. At least the return expression.
All these single-line solutions of low-score katas look absolutely unreadable. This breaks the 3rd zen rule of python.