/usr/lib/python3/dist-packages/nltk/classify/ is in python3-nltk 3.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/nltk/classify/__init__.py
/usr/lib/python3/dist-packages/nltk/classify/api.py
/usr/lib/python3/dist-packages/nltk/classify/decisiontree.py
/usr/lib/python3/dist-packages/nltk/classify/maxent.py
/usr/lib/python3/dist-packages/nltk/classify/megam.py
/usr/lib/python3/dist-packages/nltk/classify/naivebayes.py
/usr/lib/python3/dist-packages/nltk/classify/positivenaivebayes.py
/usr/lib/python3/dist-packages/nltk/classify/rte_classify.py
/usr/lib/python3/dist-packages/nltk/classify/scikitlearn.py
/usr/lib/python3/dist-packages/nltk/classify/svm.py
/usr/lib/python3/dist-packages/nltk/classify/tadm.py
/usr/lib/python3/dist-packages/nltk/classify/util.py
/usr/lib/python3/dist-packages/nltk/classify/weka.py