I was a bit wrong about that. For some reason I imagined that there would be quite a few args being passed to zip, when in fact there are just the three iterato

I was a bit wrong about that. For some reason I imagined that there would be quite a few args being passed to zip, when in fact there are just the three iterators. It does create a temporary list, but it's so small it's negligible. Using izip wouldn't really change anything.