/usr/lib/python3/dist-packages/icalendar/tests/__init__.py is in python3-icalendar 3.8-1.
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 | # unittest/unittest2 importer
import unittest
if not hasattr(unittest.TestCase, 'assertIsNotNone'):
import unittest2 as unittest
unittest # pep 8
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