/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/ is in python-networkx 1.11-1ubuntu2.
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..
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_betweenness_centrality.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_betweenness_centrality_subset.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_closeness_centrality.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_communicability.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_current_flow_betweenness_centrality.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_current_flow_betweenness_centrality_subset.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_current_flow_closeness.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_degree_centrality.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_dispersion.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_eigenvector_centrality.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_harmonic_centrality.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_katz_centrality.py
/usr/lib/python2.7/dist-packages/networkx/algorithms/centrality/tests/test_load_centrality.py