Cant "print" the "image": UserWarning: Matplotlib is currently using module://drawilleplot, which is a non-GUI backend, so cannot show the figure.

[KIC]

When I try to render the ascii image using fig.show() then I get this warning:

UserWarning: Matplotlib is currently using module://drawilleplot, which is a non-GUI backend, so cannot show the figure.

The code runs on a headless server which has no gui, which is the reason I want to use drawilleplot in the first place ;-)
Is there another way I can get the ascii representation?