/usr/lib/python2.7/dist-packages/sphinx/util/smartypants.py is in python-sphinx 1.1.3+dfsg-2ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/sphinx/util/../../../../../share/pyshared/sphinx/util/smartypants.py