It depends - Rails has so many conventions used (magic behavior) that, while useful, you have to learn them all and even how to override that behavior, before being able to tackle anything else other than simple blogging software; although the learning experience is enjoyable.

On the other hand Django is an (arguably) thin layer on top of Python. You can start from the URLs specifications and how to construct a simple HttpResponse object. And that's all you need to know and how tutorials teach it -- for everything else you can rely on your previously learned skills, while learning shortcuts on the way.

For another perspective -- Rails learning is top-down, while Django is bottom-up.