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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, my Python solution is still working.
That's generally how random tests work. Your solution is probably "almost good", it just handles some cases incorrectly, and such test cases are generated for each test run with different frequency. To pinpoint your issue, you can check what inputs cause your solution to fail, recreate such test case locally in your IDE, and debug through it.