/usr/lib/python3/dist-packages/piston3/ is in python3-django-piston3 0.3~rc2-3ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/piston3/__init__.py
/usr/lib/python3/dist-packages/piston3/admin.py
/usr/lib/python3/dist-packages/piston3/authentication.py
/usr/lib/python3/dist-packages/piston3/decorator.py
/usr/lib/python3/dist-packages/piston3/doc.py
/usr/lib/python3/dist-packages/piston3/emitters.py
/usr/lib/python3/dist-packages/piston3/fixtures/
/usr/lib/python3/dist-packages/piston3/fixtures/models.json
/usr/lib/python3/dist-packages/piston3/fixtures/oauth.json
/usr/lib/python3/dist-packages/piston3/forms.py
/usr/lib/python3/dist-packages/piston3/handler.py
/usr/lib/python3/dist-packages/piston3/handlers_doc.py
/usr/lib/python3/dist-packages/piston3/managers.py
/usr/lib/python3/dist-packages/piston3/middleware.py
/usr/lib/python3/dist-packages/piston3/models.py
/usr/lib/python3/dist-packages/piston3/oauth.py
/usr/lib/python3/dist-packages/piston3/resource.py
/usr/lib/python3/dist-packages/piston3/signals.py
/usr/lib/python3/dist-packages/piston3/store.py
/usr/lib/python3/dist-packages/piston3/templates/
/usr/lib/python3/dist-packages/piston3/templates/documentation.html
/usr/lib/python3/dist-packages/piston3/templates/piston/
/usr/lib/python3/dist-packages/piston3/templates/piston/authorize_token.html
/usr/lib/python3/dist-packages/piston3/test.py
/usr/lib/python3/dist-packages/piston3/tests.py
/usr/lib/python3/dist-packages/piston3/utils.py
/usr/lib/python3/dist-packages/piston3/validate_jsonp.py