/usr/lib/python3/dist-packages/migrate/changeset/ is in python3-migrate 0.10.0-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3/dist-packages/migrate/changeset/__init__.py
/usr/lib/python3/dist-packages/migrate/changeset/ansisql.py
/usr/lib/python3/dist-packages/migrate/changeset/constraint.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/
/usr/lib/python3/dist-packages/migrate/changeset/databases/__init__.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/firebird.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/ibmdb2.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/mysql.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/oracle.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/postgres.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/sqlite.py
/usr/lib/python3/dist-packages/migrate/changeset/databases/visitor.py
/usr/lib/python3/dist-packages/migrate/changeset/schema.py
/usr/lib/python3/dist-packages/migrate/changeset/util.py