text: #! /usr/bin/env python
  from __future__ import print_function
  from OpenGL.GLUT import *
  
  delay = 1
  count = 0
  
  def timerCallback(value):
      global count
      count += 1
      if count % 2000 == 0: print(count)
      glutTimerFunc( delay, timerCallback, value+1 )
  
  if __name__ == "__main__":
      glutInit( sys.argv )
      glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH )
      glutInitWindowSize( 100, 100 )
      glutCreateWindow( "testtimer" )
  
      glutTimerFunc( delay, timerCallback, 0 )
  
      glutMainLoop()
  