PythonPlot: zoomed insert as subplot? Can/should mpl_toolkits.axes_grid1 be used? #51

I'm using PythonPlot, and would like to create zoomed inserts within plots, as demonstrated in this discussion

That uses a possibly deprecated MPL toolkit.
(The flag at the top of that site suggests it's unstable, but the URL says "stable".)

Is that toolkit the best or only choice with PythonPlot?

How could one install it?

thanks