/usr/lib/python3/dist-packages/astroML/density_estimation/ is in python3-astroml 0.3-6.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/astroML/density_estimation/__init__.py
/usr/lib/python3/dist-packages/astroML/density_estimation/bayesian_blocks.py
/usr/lib/python3/dist-packages/astroML/density_estimation/density_estimation.py
/usr/lib/python3/dist-packages/astroML/density_estimation/empirical.py
/usr/lib/python3/dist-packages/astroML/density_estimation/gauss_mixture.py
/usr/lib/python3/dist-packages/astroML/density_estimation/histtools.py
/usr/lib/python3/dist-packages/astroML/density_estimation/tests/
/usr/lib/python3/dist-packages/astroML/density_estimation/tests/__init__.py
/usr/lib/python3/dist-packages/astroML/density_estimation/tests/test_bayesian_blocks.py
/usr/lib/python3/dist-packages/astroML/density_estimation/tests/test_density.py
/usr/lib/python3/dist-packages/astroML/density_estimation/tests/test_empirical.py
/usr/lib/python3/dist-packages/astroML/density_estimation/tests/test_hist_binwidth.py
/usr/lib/python3/dist-packages/astroML/density_estimation/tests/test_xdeconv.py
/usr/lib/python3/dist-packages/astroML/density_estimation/xdeconv.py