If you don't have tkinter on your system, and my version of xubuntu doesn't doesn't by default, then running the toy-model script just outputs the text and doesn't generate the graphics along with.
Matplotlib will also print the following warning "UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.” which was my hint that I was supposed to be seeing something.
If you don't have tkinter on your system, and my version of xubuntu doesn't doesn't by default, then running the toy-model script just outputs the text and doesn't generate the graphics along with.
Matplotlib will also print the following warning "UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.” which was my hint that I was supposed to be seeing something.