def flush(self):
        if not self._events:
            return defer.succeed(None)
        d = defer.Deferred()
        self._flushObservers.append(d)
        return d
Zero a vector-valued Dat.
dataset/ETHPy150Open warner/petmail/petmail/eventual.py/_SimpleCallQueue.flush--crossover with--dataset/ETHPy150Open OP2/PyOP2/test/unit/test_direct_loop.py/TestDirectLoop.test_zero_2d_dat