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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.
inputting xx alone is not a string. You must add " or ' around the xx to let Python know it is a string and not a variable name or something else.
I'm pretty new to Python, and this was my very first "real" kata. I'm sure there are plenty of built-in functions that I'm not using to really simplify this down.