/usr/lib/python2.7/test/test_doctest3.txt is in libpython2.7-testsuite 2.7.11-7ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | Here we check that `__file__` is provided:
>>> type(__file__)
<type 'str'>
|