def clear(self):
        self._reverse_mapping = {
            self.root_path: self._root,
        }
        for node in list(self._root.reverse_iter()):
            node.disassociate()
Remove all nodes (except the root) from this filesystem.
dataset/ETHPy150Open openstack/taskflow/taskflow/persistence/backends/impl_memory.py/FakeFilesystem.clear