/usr/lib/python2.7/dist-packages/dbus/_expat_introspect_parser.py is in python-dbus 1.0.0-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/dbus/../../../../share/pyshared/dbus/_expat_introspect_parser.py