That looks pretty efficient to me :) Well done!

I like your try except btw, that is exactly the python way of asking for forgiveness, not for permission. 

Here is a tip! for getting back on it and improving it :) 

If you want you can look at my solution, I made a few things that make it more maintainable (but it get's longer with it) so I would love to hear your feedback on that.

And I would be glad if you would make a small post about it explaining how you tackeled the task, what your thinking was etc. :)