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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.
for the case of python use string.rstrip() # in the parentheses denote the character(,/n etc) that you want to remove
A problem with your code is not a kata issue. Read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution