/usr/lib/pyshared/python2.7/Cheetah/_namemapper.so is in python-cheetah 2.4.4-2ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.7/Cheetah/../../../python2.7/dist-packages/Cheetah/_namemapper.so