/usr/lib/python2.7/dist-packages/isbnlib/dev/ is in python-isbnlib 3.5.6-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/isbnlib/dev/__init__.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_bouth23.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_coverscache.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_data.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_exceptions.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_files.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_fmt.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_helpers.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/_shelvecache.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/bouth23.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/helpers.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/vias.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/webquery.py
/usr/lib/python2.7/dist-packages/isbnlib/dev/webservice.py