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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.
It might be a good idea to research how arguments are passed by reference in python. I'd suggest googling for it.
Thanks for the clarification. They are very useful and broaden my knowledge on this subject.
Should have added a spoiler tag, I guess