> Incidentally, it's not as if there's any standard library 'node' class with a children method. This was a structure they defined, but did not share the defini

> Incidentally, it's not as if there's any standard library 'node' class with a children method. This was a structure they defined, but did not share the definition of. Ahh, that makes things much clearer. Since they weren't otherwise mentioned, I supposed that "value" and "children" were properties of some existing Python collection object - and that the question was asking how "queue.extend" expected that collection to be passed in. I guess this is the inverse of a language-specific question - if one knows that "children" has no significance in Python then I suppose the question would be clearer.