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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.
Read up on how Python's
rangefunction works, specifically how it handles boundaries. If you fix that issue you won't need your strange exception handling bit at the end.