/usr/lib/python2.7/dist-packages/pytest.py is in python-pytest 2.2.4-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/../../../share/pyshared/pytest.py
/usr/lib/python2.7/dist-packages/../../../share/pyshared/pytest.py