Checking screen is active on Mac

screenActiveMac.bash

#!/bin/bash

# $screenActive=1 means the screen is active and O is inactive
# View the explanation of the CGSession dictionary at
# https://stackoverflow.com/questions/11505255/osx-check-if-the-screen-is-locked
function checkScreenActiveMac {
  python -c 'import sys,Quartz;\
    d=Quartz.CGSessionCopyCurrentDictionary();\
    sys.exit(d and \
      d.get("CGSSessionScreenIsLocked", 0) == 0 and \
      d.get("kCGSSessionOnConsoleKey", 0) == 1)'
  screenActive=$?
}