/usr/share/devhelp/books/python2.7 is in python2.7-doc 2.7.9-2+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/devhelp/books/../../doc/python2.7/html
/usr/share/devhelp/books/../../doc/python2.7/html