/usr/lib/python2.7/dist-packages/sagenb-1.0.1.egg-info/dependency_links.txt is in python-sagenb 1.0.1+ds1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | http://github.com/mitsuhiko/flask-oldsessions/tarball/master#egg=flask-oldsessions-0.10
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