/usr/lib/python2.7/dist-packages/mod_python/importer.py is in libapache2-mod-python 3.3.1-9ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/mod_python/../../../../share/pyshared/mod_python/importer.py