/usr/lib/python2.7/dist-packages/sage/numerical/ is in sagemath-common 7.4-9.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/sage/numerical/__init__.py
/usr/lib/python2.7/dist-packages/sage/numerical/all.py
/usr/lib/python2.7/dist-packages/sage/numerical/backends/
/usr/lib/python2.7/dist-packages/sage/numerical/backends/__init__.py
/usr/lib/python2.7/dist-packages/sage/numerical/backends/coin_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/cplex_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/generic_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/generic_sdp_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/glpk_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/glpk_exact_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/glpk_graph_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/gurobi_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/interactivelp_backend.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/backends/logging_backend.py
/usr/lib/python2.7/dist-packages/sage/numerical/interactive_simplex_method.py
/usr/lib/python2.7/dist-packages/sage/numerical/knapsack.py
/usr/lib/python2.7/dist-packages/sage/numerical/linear_functions.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/linear_tensor.py
/usr/lib/python2.7/dist-packages/sage/numerical/linear_tensor_constraints.py
/usr/lib/python2.7/dist-packages/sage/numerical/linear_tensor_element.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/mip.pxd
/usr/lib/python2.7/dist-packages/sage/numerical/optimize.py
/usr/lib/python2.7/dist-packages/sage/numerical/sdp.pxd