glGenVertexArrays producing 'invalid enumerant' error.

Version stuff:
Python 2.7.1+ (r271:86832, Apr 11 2011, 18:05:24) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
import OpenGL
OpenGL.__version__
'3.0.2a1'
I'm using FORWARD_COMPATIBLE_ONLY, context version 3.3 and GLUT_CORE_PROFILE.


I'm porting a working (same machine and environment etc) C program to Python, 
and the glGenVertexArrays function is giving me grief.

The pythonic form:
    vao = glGenVertexArrays(1)
produces "TypeError: this function takes at least 2 arguments" which I presume 
means it hasn't been wrapped yet.

The ctypes form:
    vao = GLuint()
    glGenVertexArrays(1, ctypes.byref(vao))
produces:
Traceback (most recent call last):
  File "main.py", line 230, in <module>
    main(sys.argv)
  File "main.py", line 221, in main
    init()
  File "main.py", line 155, in init
    glGenVertexArrays(1, ctypes.byref(vao))
  File "/usr/local/lib/python2.7/dist-packages/OpenGL/platform/baseplatform.py", 
line 372, in __call__
    return self( *args, **named )
  File "/usr/local/lib/python2.7/dist-packages/OpenGL/error.py", line 208, in 
glCheckError
    baseOperation = baseOperation,
OpenGL.error.GLError: GLError(
	err = 1280,
	description = 'invalid enumerant',
	baseOperation = glGenVertexArrays,
	cArguments = (1, <cparam 'P' (0xb74b9b48)>)
)

I've no idea what could be causing that and googling hasn't turned up anything 
useful.

Does anyone have any suggestions as to where to look?
Are there any known working examples of using vertex array objects and pyopengl 
that I could cross check against?

G


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