idle time on windows

idle.py

#!/usr/bin/env python

from ctypes import Structure, windll, c_uint, sizeof, byref
import time

class LASTINPUTINFO(Structure):
    _fields_ = [
        ('cbSize', c_uint),
        ('dwTime', c_uint),
    ]

def get_idle_duration():
    lastInputInfo = LASTINPUTINFO()
    lastInputInfo.cbSize = sizeof(lastInputInfo)
    windll.user32.GetLastInputInfo(byref(lastInputInfo))
    millis = windll.kernel32.GetTickCount() - lastInputInfo.dwTime
    return millis / 1000.0

while True:
	time.sleep (2.0)
	idleness=get_idle_duration()
	if idleness> 10:
		print "away (%d sec w/o iteract)"%idleness
	else:
		print "active (%d sec w/o iteract)"%idleness