Ruby Books

I have been working on ruby. Best book I have found is "Programmin Ruby" By Dave Thomas.

The language which has best documentation is "PHP" . The php manual is all what you need, I was searching something like that in ruby and 'Programming Ruby' is the gem.

Sadly I haven't found such documentation for Python.
http://docs.python.org/ is 'ok' to me but it has not been effective like 'php' or 'ruby' .