[mod_python] How do I use PythonTransHandler?

> 
> Well, req.filename is definitely _not_ read-only. This may be another
> bug in the documentation, but the code is there in requestobject.c to
> set that attribute. I just ran a couple of tests, and I can set the
> filename for a request, and Apache will return that file.
> 
I forgot to mention I was using debian woody (stable), with mod_python
version 2.7.8