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His Google+ post says they're "parting as the best of friends", so it doesn't sound like he's unhappy with Google. Maybe he just feels like a change?

What is it that Dropbox offered to lure him?

Well, isn't Dropbox written in Python...?

A lot of things written in Python. It's hardly an incentive enough to pluck someone from Google.

I'm sick of Google being hailed as a magical place you'd have to be crazy to leave. Look: Google sucks. All technology companies suck, albeit in different ways. It's possible for a talented, rational person to hate working at Google, and I don't care for all the Googlers on HN saying otherwise.

Sure, I'm not suggesting that was the only factor. Only that, I bet it played a part in tipping the scales? :)

Also, while there are plenty of shops using Python, Dropbox is certainly one of the ones seeing an appreciable amount of success, no?

He worked with Python on the App Engine team as well.

Cash. Lots of cash.