/usr/share/pyshared/zope.app.pagetemplate-3.11.2.egg-info/namespace_packages.txt is in python-zope.app.pagetemplate 3.11.2-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | zope
zope.app
|