/usr/lib/python3/dist-packages/networkx/algorithms/approximation/ is in python3-networkx 1.11-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/__init__.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/clique.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/clustering_coefficient.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/connectivity.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/dominating_set.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/independent_set.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/kcomponents.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/matching.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/ramsey.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_approx_clust_coeff.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_clique.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_connectivity.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_dominating_set.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_independent_set.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_kcomponents.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_matching.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_ramsey.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/tests/test_vertex_cover.py
/usr/lib/python3/dist-packages/networkx/algorithms/approximation/vertex_cover.py