[mod_python] psp does not work

my configfle file:
<Directory /var/www/html/test> 
    AddHandler mod_python .psp
    PythonHandler mod_python.psp
    PythonDebug On
</Directory>
but,when i go to http://192.168.0.1/test/helloword.psp,i got the source file .(it remain contain the <%%> flag)