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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.
If statements are 8 kyu. What is 8 kyu exactly then. Multiply, add, subtract, divide: one operation katas?
You have to return a list.
Kata ranks can't be changed.
Python tests may be not extensive enough, and you got lucky with a slightly faulty solution.
Looking at your solution, what would happen if the average was 89.33? Maybe that's where the errors happened.
Anyway, no real issues here.
already raised below.
You have to choose right language version for new features to work...
Looks like a CodeWars issue not related to the kata itself.
Report CodeWars issues on the GitHub project.
Here: https://github.com/Codewars/codewars.com/issuesissues