/usr/lib/python2.7/dist-packages/mx/DateTime/mxDateTime/testcoerce.py is in python-egenix-mxdatetime 3.2.1-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/mx/DateTime/mxDateTime/../../../../../../share/pyshared/mx/DateTime/mxDateTime/testcoerce.py