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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.
Haskell translation
python new test frameworks
I didn't understand how the first test is supposed to return 6 and the last, -1.
Python: In the last 100 random tests, the expected output is always 100. Arrays could be modified to include something more useful.
Needs random tests expecting negative outputs (see my solution).