/usr/lib/python2.7/dist-packages/drv_libxml2.py is in python-libxml2 2.7.8.dfsg-5.1ubuntu4.17.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/../../../share/pyshared/drv_libxml2.py