Rating: 

author wanted to achieve: it's too thin on the details to be a reference

work (plus, it lacks the tables of options, commands, methods, etc.)

to make it referential; it's not focused on teaching concepts.

I'm a disappointed buyer. If I were asked to recommend a good book

on Python's library, I'd recommend _Python:_The Essential_Reference_,

by New Riders.

(It does seem that O'Reilly is working on Python In a Nutshell, though,

and if that's as good as Perl in a Nutshell, it would be *great* !)