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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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Agreed, it's not clear that duplicates are to be removed, nor the extra newline
You could try submitting a translation of this kata to Python or wait for someone else to do that.
Basically you have to port the code of this kata to another language, in this case Python.
It's not so nice to make a kata that's exactly equal to some other, that's what translations are for.
This kata looks pretty similar to this other kata: https://www.codewars.com/kata/represent-array-of-numbers-as-ranges but that's for javascript, so no Python code there either.
Here you have another with a Python version: https://www.codewars.com/kata/range-extraction