Hello,
there is something on
http://www.ruby-lang.org/en/documentation/ruby-from-other-languages/to-ruby-from-python/

The german version seems to be more detailed:
http://www.ruby-lang.org/de/documentation/ruby-from-other-languages/to-ruby-from-python/

Regards,
Tammo

P.S. If this message comes several times. My news-Views crashes while
sending the message.

r wrote:

> Hello all,
> I am a Python programmer and a Ruby Nuby. I have not found a guide
> available for Python programmers wishing to learn Ruby. I know Python
> and would like to write a tut so future people in my position can make
> the change easier.
> 
> Would anybody who knows the Ruby language care to get involved in this
> project?
> 
> I want to set up some examples like -- How do you handle situations in
> Ruby where you would use a list comprehension in Python? for example
> to iterate over a container selecting the items that pass a test [obj
> for obj in list if obj.attribute == this] ,etc, etc...
> 
> This would help to break the ice.