def construct_scalar(self, node):
        if not isinstance(node, ScalarNode):
            raise ConstructorError(None, None,
                    "expected a scalar node, but found %s" + node.id,
                    node.start_mark)
        return node.value
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/yaml-3.10/yaml/constructor.py/BaseConstructor.construct_scalar/operator `%` -> `+`