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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.
Where did you see that test case? I don't see such a test case for Python version now.
In any case, a good way to reduce the chances of having a problematic solution to pass is to add random test cases, which has been raised as an issue for this kata already.