/usr/lib/python2.7/dist-packages/numpy/ma/ is in python-numpy 1:1.13.3-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/numpy/ma/__init__.py
/usr/lib/python2.7/dist-packages/numpy/ma/bench.py
/usr/lib/python2.7/dist-packages/numpy/ma/core.py
/usr/lib/python2.7/dist-packages/numpy/ma/extras.py
/usr/lib/python2.7/dist-packages/numpy/ma/mrecords.py
/usr/lib/python2.7/dist-packages/numpy/ma/setup.py
/usr/lib/python2.7/dist-packages/numpy/ma/tests/
/usr/lib/python2.7/dist-packages/numpy/ma/tests/test_core.py
/usr/lib/python2.7/dist-packages/numpy/ma/tests/test_deprecations.py
/usr/lib/python2.7/dist-packages/numpy/ma/tests/test_extras.py
/usr/lib/python2.7/dist-packages/numpy/ma/tests/test_mrecords.py
/usr/lib/python2.7/dist-packages/numpy/ma/tests/test_old_ma.py
/usr/lib/python2.7/dist-packages/numpy/ma/tests/test_regression.py
/usr/lib/python2.7/dist-packages/numpy/ma/tests/test_subclassing.py
/usr/lib/python2.7/dist-packages/numpy/ma/testutils.py
/usr/lib/python2.7/dist-packages/numpy/ma/timer_comparison.py
/usr/lib/python2.7/dist-packages/numpy/ma/version.py
/usr/lib/python2.7/dist-packages/numpy/matrixlib/__init__.py
/usr/lib/python2.7/dist-packages/numpy/matrixlib/defmatrix.py
/usr/lib/python2.7/dist-packages/numpy/matrixlib/setup.py
/usr/lib/python2.7/dist-packages/numpy/matrixlib/tests/
/usr/lib/python2.7/dist-packages/numpy/matrixlib/tests/test_defmatrix.py
/usr/lib/python2.7/dist-packages/numpy/matrixlib/tests/test_multiarray.py
/usr/lib/python2.7/dist-packages/numpy/matrixlib/tests/test_numeric.py
/usr/lib/python2.7/dist-packages/numpy/matrixlib/tests/test_regression.py