/usr/lib/python2.7/dist-packages/git/diff.py is in python-git 0.3.2~RC1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/git/../../../../share/pyshared/git/diff.py
/usr/lib/python2.7/dist-packages/git/../../../../share/pyshared/git/diff.py