For those using Python, be aware that this Kata is only working for Python 2.7.6 , and therefore the functions may act differently than you are used to with Python 3! It caught me out for a while.

Sure. I marked it as an issue because someone else had the same issue 3 months ago, and had had no follow-up, so I thought it maybe it had come up as a problem. My bad. Took some time away, ran back through and realised the problem in my code. Thanks for the push and the kata :)

Test case 8 for Python appears to be wrong. Using my decryption function on the expected answer does not match whats given, despite my decryption function being correct for all other test cases.

Test.assert_equals(encrypt("This kata is very interesting!", 1), "hskt svr neetn!Ti aai eyitrsig")

I'm having the same issue. Running the string through my encryption (which resulted in correct answers up until that point), gives me a different string than the answer they expect from decryption!