macOS - python - Detect active user at console (must run locally)

gistfile1.txt

#!/usr/bin/python
# Check for user presence at console by checking for screen lock and console login status
# Thanks to https://stackoverflow.com/users/908494/abarnert at
#    https://stackoverflow.com/a/11511419/4326287

import sys
import Quartz
from datetime import datetime
from dateutil.tz import tzlocal
import time

while True:
  try:
    # python2 way
    timestamp=datetime.now(tzlocal()).replace(microsecond=0).isoformat(' ')

    d=Quartz.CGSessionCopyCurrentDictionary()
    userPresent=(d and
             d.get("CGSSessionScreenIsLocked", 0) == 0 and
             d.get("kCGSSessionOnConsoleKey", 0) == 1)
    if userPresent:
      print(timestamp + ' [userPresence.py] User presence detected')
    else:
      print(timestamp + ' [userPresence.py] Screen is locked or user is not logged in at console')
    time.sleep(10)
  # break
  except KeyboardInterrupt as error:
    print(timestamp + ' [userPresence.py] Received interrupt (^C) - terminating\n')
    break

sys.exit(userPresent)