/usr/lib/python2.7/dist-packages/networkx/readwrite/ is in python-networkx 1.8.1-0ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/networkx/readwrite/__init__.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/adjlist.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/edgelist.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/gexf.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/gml.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/gpickle.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/graphml.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/__init__.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/adjacency.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/node_link.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/serialize.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/tests/
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/tests/test_adjacency.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/tests/test_node_link.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/tests/test_serialize.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/tests/test_tree.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/json_graph/tree.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/leda.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/multiline_adjlist.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/nx_shp.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/nx_yaml.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/p2g.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/pajek.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/sparsegraph6.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_adjlist.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_edgelist.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_gexf.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_gml.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_gpickle.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_graphml.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_leda.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_p2g.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_pajek.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_shp.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_sparsegraph6.py
/usr/lib/python2.7/dist-packages/networkx/readwrite/tests/test_yaml.py