/usr/lib/python2.7/dist-packages/mdp/test/test_parallelnodes.py is in python-mdp 3.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/mdp/test/../../../../../share/pyshared/mdp/test/test_parallelnodes.py