/usr/lib/python3/dist-packages/nbxmpp/ is in python3-nbxmpp 0.5.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/nbxmpp/__init__.py
/usr/lib/python3/dist-packages/nbxmpp/auth_nb.py
/usr/lib/python3/dist-packages/nbxmpp/bosh.py
/usr/lib/python3/dist-packages/nbxmpp/c14n.py
/usr/lib/python3/dist-packages/nbxmpp/client_nb.py
/usr/lib/python3/dist-packages/nbxmpp/dispatcher_nb.py
/usr/lib/python3/dist-packages/nbxmpp/features_nb.py
/usr/lib/python3/dist-packages/nbxmpp/idlequeue.py
/usr/lib/python3/dist-packages/nbxmpp/plugin.py
/usr/lib/python3/dist-packages/nbxmpp/protocol.py
/usr/lib/python3/dist-packages/nbxmpp/proxy_connectors.py
/usr/lib/python3/dist-packages/nbxmpp/rndg.py
/usr/lib/python3/dist-packages/nbxmpp/roster_nb.py
/usr/lib/python3/dist-packages/nbxmpp/simplexml.py
/usr/lib/python3/dist-packages/nbxmpp/smacks.py
/usr/lib/python3/dist-packages/nbxmpp/stringprepare.py
/usr/lib/python3/dist-packages/nbxmpp/tls_nb.py
/usr/lib/python3/dist-packages/nbxmpp/transports_nb.py