[mod_python] Test page displayed as plain text file

I have successifuly built mod_python from source. When I try test page
it is not being executed by python, but it is being returned as a plain
text file. I get in my browser the exact python code from the test file.
I suspect there is something wrong with my apache configuration file.

I am using Apache HTTP 1.3.34 with mod_python 2.7.11, and Python is
2.3.4
OS is Red Hat Enterprise Server.

Can anybody help me with this?



1. These are relevant section of my HTTP.CONF file:

#
# Dynamic Shared Object (DSO) Support
#
LoadModule php4_module        libexec/libphp4.so
LoadModule python_module      libexec/mod_python.so

#
# DocumentRoot: The directory out of which you will serve your
#
DocumentRoot "/var/www"

#
# This should be changed to whatever you set DocumentRoot to.
#
<Directory "/var/www">
    Options Indexes FollowSymLinks MultiViews
    AllowOverride None
    Order allow,deny
    Allow from all
</Directory>

<Directory "/var/www/wiki">
        AddHandler mod_python .py
        PythonHandler mptest
        PythonDebug On
</Directory>

#
# AccessFileName: The name of the file to look for in each directory
#
AccessFileName .htaccess

#
# DefaultType is the default MIME type the server will use for a
document
#
DefaultType text/plain

#
# Document types.
#
<IfModule mod_mime.c>

    #
    # AddType allows you to tweak mime.types without actually editing
it, or to
    #
    AddType application/x-tar .tgz
    AddType application/x-httpd-php .php .phtml
    AddType application/x-httpd-php-source .phps

    #
    # AddHandler allows you to map certain file extensions to
"handlers",
    # actions unrelated to filetype. These can be either built into the
server
    # or added with the Action command (see below)
    #
    # If you want to use server side includes, or CGI outside
    # ScriptAliased directories, uncomment the following lines.
    #
    # To use CGI scripts:
    #
    #AddHandler cgi-script .cgi

    #
    # To use server-parsed HTML files
    #
    #AddType text/html .shtml
    #AddHandler server-parsed .shtml

    #
    # Uncomment the following line to enable Apache's send-asis HTTP
file
    # feature
    #
    #AddHandler send-as-is asis

    #
    # If you wish to use server-parsed imagemap files, use
    #
    #AddHandler imap-file map

    #
    # To enable type maps, you might want to use
    #
    #AddHandler type-map var

</IfModule>
# End of document types.

2. This is mmy mptest.py file (with permissions 0755):

from mod_python import apache

def handler(req):
     req.content_type = 'text/plain'
     req.write("Hello World!")
     return apache.OK



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