Hello,
It's been a long time this you posted this message but I'll try to answer it anyway.
The first question is 'did you installed pyf in a virtualenv or in your python system environment ?'
If you did not use virtualenv (
http://pypi.python.org/pypi/virtualenv) to do your pyf installation please do so, it might solve your problem.
In case it does not, come back here.
Cheers.