Bizarro Error "AttributeError: __class__"

In case of errors of the following form:

$ python test.py 
No handlers could be found for logger "OpenGL.arrays.arraydatatype"
Traceback (most recent call last):
  File "test.py", line 135, in 
    jpg_file_write("helix/helix", t, glReadPixels( 0,0, 800, 600, GL_RGBA, GL_UNSIGNED_BYTE))
  File "/var/lib/python-support/python2.5/OpenGL/GL/images.py", line 319, in glReadPixels
    imageData = arrayType.dataPointer(array)
  File "/var/lib/python-support/python2.5/OpenGL/arrays/arraydatatype.py", line 38, in dataPointer
    return cls.getHandler(value).dataPointer( value )
  File "/var/lib/python-support/python2.5/OpenGL/arrays/formathandler.py", line 17, in __call__
    typ = value.__class__
AttributeError: __class__

Try to install the latest PyOpenGL package.