/usr/lib/python2.7/dist-packages/twistedcaldav/query/ is in calendarserver 5.2+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/twistedcaldav/query/__init__.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/addressbookquery.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/addressbookqueryfilter.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/calendarquery.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/calendarqueryfilter.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/expression.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/sqlgenerator.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/test/
/usr/lib/python2.7/dist-packages/twistedcaldav/query/test/__init__.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/test/test_addressbookquery.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/test/test_calendarquery.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/test/test_expression.py
/usr/lib/python2.7/dist-packages/twistedcaldav/query/test/test_queryfilter.py