/usr/lib/python2.7/dist-packages/twext/enterprise/dal/ is in calendarserver 5.2+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/__init__.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/model.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/parseschema.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/record.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/syntax.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/test/
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/test/__init__.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/test/test_parseschema.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/test/test_record.py
/usr/lib/python2.7/dist-packages/twext/enterprise/dal/test/test_sqlsyntax.py