/usr/lib/python2.7/dist-packages/stetl/filters/ is in python-stetl 1.1+ds-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/stetl/filters/__init__.py
/usr/lib/python2.7/dist-packages/stetl/filters/formatconverter.py
/usr/lib/python2.7/dist-packages/stetl/filters/gmlfeatureextractor.py
/usr/lib/python2.7/dist-packages/stetl/filters/gmlsplitter.py
/usr/lib/python2.7/dist-packages/stetl/filters/nullfilter.py
/usr/lib/python2.7/dist-packages/stetl/filters/packetbuffer.py
/usr/lib/python2.7/dist-packages/stetl/filters/packetwriter.py
/usr/lib/python2.7/dist-packages/stetl/filters/stringfilter.py
/usr/lib/python2.7/dist-packages/stetl/filters/templatingfilter.py
/usr/lib/python2.7/dist-packages/stetl/filters/xmlassembler.py
/usr/lib/python2.7/dist-packages/stetl/filters/xmlelementreader.py
/usr/lib/python2.7/dist-packages/stetl/filters/xmlvalidator.py
/usr/lib/python2.7/dist-packages/stetl/filters/xsltfilter.py
/usr/lib/python2.7/dist-packages/stetl/filters/zipfileextractor.py