/usr/lib/python2.7/dist-packages/zope/viewlet/ is in python-zope.viewlet 3.7.2-0ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/zope/viewlet/README.txt
/usr/lib/python2.7/dist-packages/zope/viewlet/__init__.py
/usr/lib/python2.7/dist-packages/zope/viewlet/communicating-viewlets.txt
/usr/lib/python2.7/dist-packages/zope/viewlet/configure.zcml
/usr/lib/python2.7/dist-packages/zope/viewlet/css_bundle_viewlet.pt
/usr/lib/python2.7/dist-packages/zope/viewlet/css_viewlet.pt
/usr/lib/python2.7/dist-packages/zope/viewlet/directives.txt
/usr/lib/python2.7/dist-packages/zope/viewlet/interfaces.py
/usr/lib/python2.7/dist-packages/zope/viewlet/javascript_bundle_viewlet.pt
/usr/lib/python2.7/dist-packages/zope/viewlet/javascript_viewlet.pt
/usr/lib/python2.7/dist-packages/zope/viewlet/manager.py
/usr/lib/python2.7/dist-packages/zope/viewlet/meta.zcml
/usr/lib/python2.7/dist-packages/zope/viewlet/metaconfigure.py
/usr/lib/python2.7/dist-packages/zope/viewlet/metadirectives.py
/usr/lib/python2.7/dist-packages/zope/viewlet/tests.py
/usr/lib/python2.7/dist-packages/zope/viewlet/viewlet.py