/usr/lib/python2.7/dist-packages/nltk/sem/ is in python-nltk 3.2.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/nltk/sem/__init__.py
/usr/lib/python2.7/dist-packages/nltk/sem/boxer.py
/usr/lib/python2.7/dist-packages/nltk/sem/chat80.py
/usr/lib/python2.7/dist-packages/nltk/sem/cooper_storage.py
/usr/lib/python2.7/dist-packages/nltk/sem/drt.py
/usr/lib/python2.7/dist-packages/nltk/sem/drt_glue_demo.py
/usr/lib/python2.7/dist-packages/nltk/sem/evaluate.py
/usr/lib/python2.7/dist-packages/nltk/sem/glue.py
/usr/lib/python2.7/dist-packages/nltk/sem/hole.py
/usr/lib/python2.7/dist-packages/nltk/sem/lfg.py
/usr/lib/python2.7/dist-packages/nltk/sem/linearlogic.py
/usr/lib/python2.7/dist-packages/nltk/sem/logic.py
/usr/lib/python2.7/dist-packages/nltk/sem/relextract.py
/usr/lib/python2.7/dist-packages/nltk/sem/skolemize.py
/usr/lib/python2.7/dist-packages/nltk/sem/util.py