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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.
Thanks. I forked it and made the update there, since I couldn't just update it and save.
Inverter.invert(numtest, list)has an extraneous argument in the sample tests.For python you need to save the result in a new list and return it to pass the random test.
Random test is broken, not your code.