/usr/lib/ is in python-diagnostic-msgs 1.12.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/
/usr/lib/python2.7/dist-packages/
/usr/lib/python2.7/dist-packages/diagnostic_msgs/
/usr/lib/python2.7/dist-packages/diagnostic_msgs/__init__.py
/usr/lib/python2.7/dist-packages/diagnostic_msgs/srv/
/usr/lib/python2.7/dist-packages/diagnostic_msgs/srv/__init__.py
/usr/lib/python2.7/dist-packages/diagnostic_msgs/srv/_SelfTest.py
/usr/lib/python2.7/dist-packages/diagnostic_msgs/msg/
/usr/lib/python2.7/dist-packages/diagnostic_msgs/msg/_KeyValue.py
/usr/lib/python2.7/dist-packages/diagnostic_msgs/msg/__init__.py
/usr/lib/python2.7/dist-packages/diagnostic_msgs/msg/_DiagnosticArray.py
/usr/lib/python2.7/dist-packages/diagnostic_msgs/msg/_DiagnosticStatus.py