/usr/lib/python2.7/dist-packages/logilab/astng/node_classes.py is in python-logilab-astng 0.24.3-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/logilab/astng/../../../../../share/pyshared/logilab/astng/node_classes.py