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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.
This is a spoiler and it actually is bad behaviour to spoil solutions in Discussion. Sometimes you need to discuss it, then you should click the spoiler tag. In this case this seems absolutely unnecessary. Why are you doing this?
That's not how you throw an error in Python and mark your post as having spoiler content next time.