Which Python web framework is most like Ruby on Rails?

[Pierre Quentel]

In Karrigell the scripts are executed in a namespace prepared by the
framework, with HTTP environment, form data, the functions and
exceptions for authentication, session management, redirection etc.
I suppose that this falls into the first category above, "modules
(that) are designed to run linked together in a shared address space" ;
the link between the framework and the scripts is certainly much
tighter than between a web server and a CGI script

Pierre