Actually that book was one of my primary inspirations for pysdr. I told myself- what if I made something like this that was specific to wireless comms/SDR, but also just used numpy/scipy directly instead of attempting to create a python package out of it. Because if you jump to any random part of the book, it feels like the author is just trying to get you to use code from his repo (I realize the point of the books is to have you build the code up from scratch). But yeah it's a great book, especially for folks interested in doing audio or other non-RF stuff.