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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.
range
is the name of a built-in function in Python. Redefining thouse is bad.This kata, your "code" and the "testcases" are really "bad practice" - you haven't solved your own task or one part of it...