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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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The task says "Input DataFrame will never be empty. "
But one of the tests is with empty input:
Why is that?
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My goodness! I've just joined Codewars, and it seems that the most challenging aspect so far is understanding the task. There are so many terribly written instructions! Katas like that should come with a bonus for deciphering the author's intended message.
No offence, but please, consider checking the text with ChatGPt or smth before posting. There are many users for whom english is not their first language.