Although I'm not a fan of design patterns (you know, the GoF one) because people tend replace it to proper thinking. But I do like design patterns for languages and frameworks, because you can use something for a very long time and still not doing it in the right way.
The book has an interesting premise: Explain a bit something, point a problem, a solution, expand the problem and expand the solution. The problem is that some problems seem really shoe horned to certain solutions. Also, some common problems are not talked at all, like using CSRF with Ajax -- something the author mentions people shouldn't do (disable CSRF) on Ajax requests.
On the other hand, the book focus on the the most recent versions (well, almost). Instead of going in the safe road of Python 2, the book focus on Python 3 -- and, to be honest, there isn't much difference between Django with Python 3 and Django with Python 2.
Is not a bad book, but the really interesting things seem to be left out.