Parameters | request | A request object which will be passed to IRenderable.render . |
| root | An object to be made flatter. This may be of type unicode , bytes , slot , Tag , tuple , list , types.GeneratorType , Deferred , or something providing IRenderable . |
| write | A callable which will be invoked with each bytes produced by flattening root . |
Returns | An iterator which yields objects of type bytes and Deferred . A Deferred is only yielded when one is encountered in the process of flattening root . The returned iterator must not be iterated again until the Deferred is called back. |