/usr/lib/pyshared/python2.7/libxml2mod.so is in python-libxml2 2.8.0+dfsg1-7+wheezy5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.7/../../python2.7/dist-packages/libxml2mod.so