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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.
I had the same result, but this was the fault of my implementation.
Sorry, there is no error. (Look at the top of the page to see how many guys passed the Python kata).