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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.
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Very interesting task :)
Maybe I got lucky in thinking about/writing the solution, but it took literally 1 minute to finish this in Python. I think it would be better classified as a 7 kyu or 6 kyu problem
Two minor suggestions since this is probably targeted to people new to coding/codewars:
1- adding a breakdown of one of the sums, like:
sum(5) = 1 + 2 + 3 + 4 + 5 = 15
2- adding to the end of the description the largest number tested, and a disclaimer that if the solution is timing out, the code needs to be reviewed or a non-brute-force solution has to be thought out
Huge coincidence: I've just been through a few katas from that series and your comment helped me figure out this one (not a big math guy)
Thanks!
Empty lists are considered as False by Python. Using a not reverses that logic and enters the if statement when the list is empty
https://docs.python.org/3/library/stdtypes.html#truth-value-testing
YEP, WOW