Error line 81 once it detects pupils

[khinshankhan]

AttributeError: module 'cv2.cv2' has no attribute 'drawKeypoints'

(commenting out stops crash, but loses a key feature)

[stepacool]

This error can only mean you have a version mismatch, probably your OpenCV version has this function(attribute) called somehow else, maybe "keyPointsDraw" or something like that.
You can either install the correct openCV version or just look up what's the function called in your OpenCV version and replace 'drawKeypoints' part with whatever it's called.