/usr/lib/ is in python-mock 2.0.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/
/usr/lib/python2.7/dist-packages/
/usr/lib/python2.7/dist-packages/mock/
/usr/lib/python2.7/dist-packages/mock/__init__.py
/usr/lib/python2.7/dist-packages/mock/mock.py
/usr/lib/python2.7/dist-packages/mock/tests/
/usr/lib/python2.7/dist-packages/mock/tests/__init__.py
/usr/lib/python2.7/dist-packages/mock/tests/__main__.py
/usr/lib/python2.7/dist-packages/mock/tests/support.py
/usr/lib/python2.7/dist-packages/mock/tests/testcallable.py
/usr/lib/python2.7/dist-packages/mock/tests/testhelpers.py
/usr/lib/python2.7/dist-packages/mock/tests/testmagicmethods.py
/usr/lib/python2.7/dist-packages/mock/tests/testmock.py
/usr/lib/python2.7/dist-packages/mock/tests/testpatch.py
/usr/lib/python2.7/dist-packages/mock/tests/testsentinel.py
/usr/lib/python2.7/dist-packages/mock/tests/testwith.py
/usr/lib/python2.7/dist-packages/mock-2.0.0.egg-info/
/usr/lib/python2.7/dist-packages/mock-2.0.0.egg-info/PKG-INFO
/usr/lib/python2.7/dist-packages/mock-2.0.0.egg-info/dependency_links.txt
/usr/lib/python2.7/dist-packages/mock-2.0.0.egg-info/not-zip-safe
/usr/lib/python2.7/dist-packages/mock-2.0.0.egg-info/pbr.json
/usr/lib/python2.7/dist-packages/mock-2.0.0.egg-info/requires.txt
/usr/lib/python2.7/dist-packages/mock-2.0.0.egg-info/top_level.txt