/usr/lib/python2.7/dist-packages/networkx/classes/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/classes/tests/historical_tests.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_digraph.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_digraph_historical.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_function.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_graph.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_graph_historical.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_multidigraph.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_multigraph.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_ordered.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_special.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/test_timing.py
/usr/lib/python2.7/dist-packages/networkx/classes/tests/timingclasses.py