def post_order(self):
        for child in self.children:
            for node in child.post_order():
                yield node
        yield self
Attach an existing volume to an existing instance.
dataset/ETHPy150Open ctxis/canape/CANAPE.Scripting/Lib/lib2to3/pytree.py/Node.post_order--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/compute/cells_api.py/ComputeCellsAPI._attach_volume