/usr/lib/pyshared/python2.7/_pylibmc.so is in python-pylibmc 1.2.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.7/../../python2.7/dist-packages/_pylibmc.so
/usr/lib/pyshared/python2.7/../../python2.7/dist-packages/_pylibmc.so