I was asked to share the source code so that readers wouldn't have to type it all in themselves, something that potentially introduces errors.
I've shared the wakari.io IPython notebooks so you can view and run them, and copy the code as you please.
Mandelbrot fractal: notebook
Julia fractal: notebook
3D Mandelbrot lanscape: notebook
3D Julia landscape: notebook
Sobel image filtered Julia set: notebook
PS. I remember the old days of typing in code from computer magazines yelllow pages, puzzling over the typing errors, and learning quite a lot from doing it actively. I'd still recommend you follow the discussion in the ebook.