new_contents: #!/usr/bin/env python
  import sys
  if sys.platform.startswith('linux'):
  	import os
  	os.system("xset dpms force off")
  elif sys.platform.startswith('win'):
  	import win32gui
  	import win32con
  	SC_MONITORPOWER = 0xF170
  	win32gui.SendMessage(win32con.HWND_BROADCAST, win32con.WM_SYSCOMMAND, SC_MONITORPOWER, 2)
  elif sys.platform.startswith('darwin'):
  	import subprocess
  	subprocess.call('echo "tell application \"Finder\" to sleep" | osascript ', shell=True)
subject: add case for mac given by rein