/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/ is in python-networkx 1.11-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_approx_clust_coeff.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_clique.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_connectivity.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_dominating_set.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_independent_set.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_kcomponents.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_matching.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_ramsey.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/approximation/tests/test_vertex_cover.py