/usr/share/doc/python-apt/html/_sources/c++/index.txt is in python-apt-doc 0.8.3ubuntu7.
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 | Python APT and C++
==================
.. toctree::
:maxdepth: 1
api
embedding
|