text: from __future__ import print_function
  from OpenGL.GL import *
  from OpenGL.GLUT import *
  from OpenGL.GLU import *
  import time
  
  resX,resY = (400,300 )
  
  def display( ):
      glutSetWindow(window);
      glClearColor (0.0, 0.0, (time.time()%1.0)/1.0, 0.0)
      glClear (GL_COLOR_BUFFER_BIT)
      glFlush ()
      glutSwapBuffers()
  
  
  if __name__ == "__main__":
      glutInit([])
      glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
  
      glutInitWindowSize(resX, resY)
  
      glutInitWindowPosition(0, 0)
      window = glutCreateWindow("hello")
      glutDisplayFunc(display)
      for name in (GL_VENDOR,GL_RENDERER,GL_SHADING_LANGUAGE_VERSION,GL_EXTENSIONS):
          print(( '%s = %r'%( name,glGetString(name))))
      
      glutMainLoop()
      
  