$ python geom-path.py                                                             
Traceback (most recent call last):
  File "geom-path.py", line 313, in <module>
    program = gloo.Program(vertex, fragment, geometry)
  File "/home/leus/playground/glumpy/glumpy/gloo/program.py", line 77, in __init__
    elif isinstance(fragment, FragmentShader, version=version):
TypeError: isinstance() takes no keyword arguments