/usr/lib/python2.7/dist-packages/sagenb/data/sage/html/accounts/base.html is in python-sagenb 1.0.1+ds1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | {% extends "html/base.html" %}
{% block body_classes %}accounts-page{% endblock %}
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