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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.
Could you elaborate on why you consider it not a good solution?
I can agree with that.
Which part?
Here the goal was to show how you can work with lambda and other python chips, so that newcomers learn something new.
Why bad practice? If this needs to be done, let's say in the key= or somewhere else like that. Here's an awkward example: arr = [(1,4),(2,3),(1,3)]; sorted(arr, key = lambda e: sum([*range(*e)]))