[Zope] Unbuffered Python Scripts

I have a script that generates a really big CSV file, which I'm doing as a python script inside Zope. Problem is, at the moment it takes huge amounts of memory and time to render, partially because the output is buffered before it's sent to the browser. Is there any way to stop this python script being buffered? Ideally I'd like each print statement to be flushed directly to the client, instead of returning "printed" at the end. -- Nicholas Avenell Technical Developer