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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.
This solution was definitely easier to understand. Smart to put the rows variable inside the loop so it resets every time to add it to the columns variable. Saves lots of space and makes it a lot more clean and concise.
I agree the only positive side to list comprehension is just how consise it is and the speed of execution (it runs faster than traditional nested loops).
No: https://stackoverflow.com/questions/30245397/why-is-a-list-comprehension-so-much-faster-than-appending-to-a-list