/usr/lib/python2.7/dist-packages/zope.session-3.9.5-nspkg.pth is in python-zope.session 3.9.5-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/../../../share/pyshared/zope.session-3.9.5-nspkg.pth