Re: [Twisted-Python] Adding callback to a Deferred that's already running?

This wasn't spectacularly obvious to me the first time either, but I think it's covered somewhere in the deferred execution howto; in your callback/errback, return a new deferred and the processing of the deferred chain will pause until that new deferred fires.  Here's an example of code that does that...

Thanks for your reply, Mike! I don't thoroughly understand your code yet, but I'm workin' on it. One of the things I don't like about the examples is that they don't demonstrate a conditional addition of a callback. One of the things I did try was returning a new Deferred from step2(), but it didn't work, and I'm not sure why. I'm checking out defer.py now to try to figure out how it works... Steve