... File "/home/codewarrior/solution.py"

-> that means the error is raised in YOUR code

... answer = [iterable[0]]
IndexError: string index out of range

And that tells you what part of your code is wrong.

Several things you should keep in mind:

• sample tests are what they are: "sample". Meaning they are only a small part of the actual test suite.
• print is your friend
• don't post an issue unless you can demonstrate that the error s in the kata itself. Issues are for that purpose only. So when you don't know what's happenning, post a question instead.

Cheers