I picked up the 2nd edition of Python in a Nutshell by Alex Martelli, Python's very own Umberto Eco. (I donated my 1st edition to my Padawan, Dan.) As expected, there's not that much changed - a few new string methods there, a new module or two there.

But one thing I was hoping for was some ElementTree coverage. The 2nd edition only covers Python 2.4 rather than 2.5, and ElementTree wasn't yet part of the standard library at that point, but ElementTree has been a hugely popular library for a while, so it's a pity it wasn't included. It's my XML API of choice, and chatting to Simon and others at last night's Python booze-up, I'm far from alone. (Tim prefers 4suite, though. To each his own, I suppose.)

Still, all in all, a must-have book. I'm not sure I'd say an upgrade is essential, though, if you have the 1st edition.