Ah yes, I see what you mean about the performance issues. While it works fine with the simple examples in this kata, it would not scale well.

Thank you for sharing your thought on this!

Are there issues with this solution that prevent it from being more highly rated as best practice? To me, this is the simplest and easiest to read.

My comment/solution was silly, impractical, and not in the spirit of the Kumite you created, so no need to apologise or thank me :D

Hi seraph776. I made the def happy_pi(birthday): return True suggestion solution mostly in jest, but some people might consider it a valid solution.

If we assume a valid input (a valid date; not "foo") and that the irrational number pi has infinite decimal places, then it could be argued that any 6-8 digit number will appear in pi. At the very least, it would be difficult to prove that the 6-8 digit number does not appear in pi.

If the input is assumed to be valid and pi is assumed to have an infinite number of decimal places, then the following could be assumed to suffice for the "is my birthday in pi?" question:

def happy_pi(birthday):
  return True