Python & Twitter

I'm working on developing a Python Twitter application, but I've hit a snag. The Twitter API requires an a secret key for your application, but I don't know how (or if) I can keep this key secret.

Ideas?

There are very popular Twitter clients such as Tweetdeck or Blu. Those examples are closed-source but I'd imagine if the interacted directly for the Twitter servers, it wouldn't be hard to capture the secret key. There's open source apps I haven't used though, like Buzzbird.