/usr/lib/python2.7/dist-packages/trytond/backend/ is in tryton-server 3.0.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/trytond/backend/__init__.py
/usr/lib/python2.7/dist-packages/trytond/backend/database.py
/usr/lib/python2.7/dist-packages/trytond/backend/mysql/
/usr/lib/python2.7/dist-packages/trytond/backend/mysql/__init__.py
/usr/lib/python2.7/dist-packages/trytond/backend/mysql/database.py
/usr/lib/python2.7/dist-packages/trytond/backend/mysql/init.sql
/usr/lib/python2.7/dist-packages/trytond/backend/mysql/table.py
/usr/lib/python2.7/dist-packages/trytond/backend/postgresql/
/usr/lib/python2.7/dist-packages/trytond/backend/postgresql/__init__.py
/usr/lib/python2.7/dist-packages/trytond/backend/postgresql/database.py
/usr/lib/python2.7/dist-packages/trytond/backend/postgresql/init.sql
/usr/lib/python2.7/dist-packages/trytond/backend/postgresql/table.py
/usr/lib/python2.7/dist-packages/trytond/backend/sqlite/
/usr/lib/python2.7/dist-packages/trytond/backend/sqlite/__init__.py
/usr/lib/python2.7/dist-packages/trytond/backend/sqlite/database.py
/usr/lib/python2.7/dist-packages/trytond/backend/sqlite/init.sql
/usr/lib/python2.7/dist-packages/trytond/backend/sqlite/table.py
/usr/lib/python2.7/dist-packages/trytond/backend/table.py