/usr/lib/python2.7/dist-packages/patsy-0.2.1.egg-info/dependency_links.txt is in python-patsy 0.2.1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/patsy-0.2.1.egg-info/../../../../share/pyshared/patsy-0.2.1.egg-info/dependency_links.txt