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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 downside is that it is only supported in python 3.6+.
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Because it is an absolutely minimal implementation, that meets the exact requirements, and it is absolutely clear what is being done.
Further, 306 people submitted exactly the same solution as me... so there is a strong argument for this being idiomatic Python code. :)