def _fetch_node(self, path, normalized=False):
        if not normalized:
            normed_path = self.normpath(path)
        else:
            normed_path = path
        try:
            return self._reverse_mapping[normed_path]
        except __HOLE__:
            raise exc.NotFound("Path '%s' not found" % path)
dataset/ETHPy150Open openstack/taskflow/taskflow/persistence/backends/impl_memory.py/FakeFilesystem._fetch_node