/usr/lib/python2.7/dist-packages/messaging/mms/mms_pdu.py is in python-messaging 0.5.11+debian-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/messaging/mms/../../../../../share/pyshared/messaging/mms/mms_pdu.py