Ctrl-f only works if you know what you are looking for though.
Just start with Rails Guides (http://guides.rubyonrails.org/). When you are somewhat familiar you can find details in the API docs (http://api.rubyonrails.org/).
One thing though, we're comparing apples and oranges; the docs for a web framework vs the docs for a standard library. Are the django docs similar to the standard lib docs?
I'm not trying to dis python, I really like python and use it whenever I need to do mathy stuff with numpy and scipy. Most other things I do in ruby.