mod_python & publisher handler

[piter]

i'm new to mod_python and trying to run publisher example:

this is what i have in httpd.conf:
<Directory "C:/Program Files/Apache Group/Apache/htdocs/python">
   AddHandler python-program .py
   PythonHandler mod_python.publisher
   PythonDebug on
#   PythonEnablePdb on
</Directory>

and my hello.py is like from "6.1.1 Introduction" paragraph
#-------------------------------------------------
""" Publisher example """

def say(req, what="NOTHING"):
    return "I am saying %s" % what

#-------------------------------------------------

and when i enter URL like: http://localhost/python/hello.py/say?what=wwww
everything is ok, i got:
I am saying wwww
but when i try: http://localhost/python/hello/say?what=wwww (note that here
i have hello instead of hello.py) i got:
I am saying NOTHINGIs it a bug of feature: i mean why can i enter URL
without .py extention and why it works but parameters are not passed?piter