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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.
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Everything's working correctly now.
jhoffner already fixed this.
You are making the mistake of saying that strings can't be iterated without converting to list.
You can already do roman[::-1] perfectly fine on any string. Strings are essentially an array from characters. You have C to thank for that.
This was a bug in Codewars that has since been fixed.
The random tests fail if you remove "import string" from the template code.