*Advanced* Python book?

[Paul Rubin]

mk <mrkafk at gmail.com> writes:
> I mean really advanced mental gymnastics, like gory details of how
> Python objects operate, how to exploit its dynamic capabilities, dos
> and donts with particular Python objects, advanced tricks, everything
> from chained decorators to metaprogramming. Dive Into Python comes
> closest to this ideal from what I have found, but still not far enough.
> 
> Anybody found such holy grail?

The favorite ones around here are "Python Cookbook" and "Python in a
Nutshell", both by Alex Martelli, who used to be a newsgroup regular
and still stops by from time to time.