/usr/share/pyshared/zope/pagetemplate/tests/output/checknotexpression.html is in python-zope.pagetemplate 3.6.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | <html>
<head></head>
<body>
<div>not:python:0</div>
</body>
</html>
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