def flush(self, full=False, all=False, force=False):
self._init()<EOL>return self.save(*self.known.values(), full=full, all=all, force=force)<EOL>
Call ``.save()`` on all modified entities in the session. Use when you
want to flush changes to Redis, but don't want to lose your local
session cache.

See the ``.commit()`` method for arguments and their meanings.