/usr/lib/python2.7/dist-packages/ffc/backends/ is in python-ffc 1.6.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/ffc/backends/__init__.py
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/__init__.py
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/capsules.py
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/form.py
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/functionspace.py
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/goalfunctional.py
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/includes.py
/usr/lib/python2.7/dist-packages/ffc/backends/dolfin/wrappers.py
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/__init__.py
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/build.py
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/dofmap.py
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/finite_element.py
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/form.py
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/function.py
/usr/lib/python2.7/dist-packages/ffc/backends/ufc/integrals.py