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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.
You should optimize your code :) I faced the same problem and did homework - optimized my loops to decrease timings. So after that I've passed "Attempt" tests too.
Time: 4788ms Passed: 50Failed: 0
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I am a novice python developer, so I used all that I know. Thanks for your advise about "isinstance", I will read about this feature.
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