It's alr fixed by Volie (see comment above)

For Python, I first wrote one without the recursive method. It passed all the tests, but it gave me an error about memory. So then I switched my solution to the recursive method. It passed all the tests, but when I submitted it, it gave some error message. It ran fine in my own computer's command line interface with Python.

I only wrote the original Ruby, Javascript, and Coffescript versions, but I have looked at the Python example solution and tests and they appear fine to me.

What problem are you having with your solution?

Have you looked at previous discussions below?