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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.
Python new test framework should be used (Refer this for more detail)
Tests should not print excessively to standard output
Mutating the input list breaks random tests.
All your tests test user output against itself, so...