def output(self, key, obj):
        try:
            data = to_marshallable_type(obj)
            return self.src_str.format(**data)
        except (__HOLE__, IndexError) as error:
            raise MarshallingException(error)
dataset/ETHPy150Open flask-restful/flask-restful/flask_restful/fields.py/FormattedString.output