/usr/lib/python2.7/dist-packages/envisage/safeweakref.py is in python-envisage 4.4.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/envisage/../../../../share/pyshared/envisage/safeweakref.py