/usr/lib/pyshared/python2.7/pyalsa/alsamixer.so is in python-pyalsa 1.0.26-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/pyshared/python2.7/pyalsa/../../../python2.7/dist-packages/pyalsa/alsamixer.so