/usr/lib/python2.7/dist-packages/csb/bio/io/ is in python-csb 1.2.2+dfsg-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/csb/bio/io/__init__.py
/usr/lib/python2.7/dist-packages/csb/bio/io/clans.py
/usr/lib/python2.7/dist-packages/csb/bio/io/cs.py
/usr/lib/python2.7/dist-packages/csb/bio/io/dssp.py
/usr/lib/python2.7/dist-packages/csb/bio/io/fasta.py
/usr/lib/python2.7/dist-packages/csb/bio/io/hhpred.py
/usr/lib/python2.7/dist-packages/csb/bio/io/mrc.py
/usr/lib/python2.7/dist-packages/csb/bio/io/noe.py
/usr/lib/python2.7/dist-packages/csb/bio/io/procheck.py
/usr/lib/python2.7/dist-packages/csb/bio/io/psipred.py
/usr/lib/python2.7/dist-packages/csb/bio/io/svg.py
/usr/lib/python2.7/dist-packages/csb/bio/io/vasco.py
/usr/lib/python2.7/dist-packages/csb/bio/io/whatif.py
/usr/lib/python2.7/dist-packages/csb/bio/io/wwpdb.py