from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *

window = 0                                             # glut window number
width, height = 500, 400                               # window size

def draw():                                            # ondraw is called all the time
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) # clear the screen
    glLoadIdentity()                                   # reset position
    
    # ToDo draw rectangle
    
    glutSwapBuffers()                                  # important for double buffering
    

# initialization
glutInit()                                             # initialize glut
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
glutInitWindowSize(width, height)                      # set window size
glutInitWindowPosition(0, 0)                           # set window position
window = glutCreateWindow("noobtuts.com")              # create window with title
glutDisplayFunc(draw)                                  # set draw function callback
glutIdleFunc(draw)                                     # draw all the time
glutMainLoop()                                         # start everything

Error:
Traceback (most recent call last):
  File "graphic.py", line 47, in <module>
    if __name__ == '__main__': main()
  File "graphic.py", line 9, in main
    glutInit(sys.argv)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35-32\lib\site-package
s\pyopengl-3.1.1a1-py3.5.egg\OpenGL\GLUT\special.py", line 333, in glutInit
    _base_glutInit( ctypes.byref(count), holder )
  File "C:\Users\User\AppData\Local\Programs\Python\Python35-32\lib\site-package
s\pyopengl-3.1.1a1-py3.5.egg\OpenGL\platform\baseplatform.py", line 407, in __ca
ll__
    self.__name__, self.__name__,
OpenGL.error.NullFunctionError: Attempt to call an undefined function glutInit,
check for bool(glutInit) before calling