AddHandler mod_python .py
PythonHandler fetch
PythonDebug On

RewriteEngine On

RewriteCond %{SCRIPT_FILENAME} !-f
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteRule \.(gif|jpe?g|png)$ fetch.py [QSA,L]

<Files fetch.py>
    Order allow,deny
    Allow from all
</Files>
<Files ~ "\.(?i:gif|jpe?g|png)$">
    Order allow,deny
    Allow from all
</Files>

Order deny,allow
Deny from all