Getting mod_python to work is hard because there are many things to get into account. Your Apache version should match the proper mod_python version, as well as the python version amd so on... If you are having many problems, I suggest installing Apache2Triad, which is a package that will install everything you need (and more) all at once.
www.apache2triad.net -- http://mail.python.org/mailman/listinfo/python-list
