/usr/lib/python2.7/dist-packages/gastables/PrandtlMeyer.py is in python-gastables 0.3-2.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/gastables/../../../../share/pyshared/gastables/PrandtlMeyer.py