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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 did the same but one-lined. In the other hand and IMHO it's not good practices create variables with names reserved by Python, even if there seems to be no risk.
Very readable with the most obvious use of the math library.
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superb