matplotlib: no interactive backends appear to work

[John Owens]

Guido Soranzio <guido.soranzio <at> gmail.com> writes:

> 
> import Tkinter
> t = Tkinter.Tk()
> 
> a window should open now instead of the previous error message:

I confirm this fix works for me (in fact I made the same fix
myself to get Tk working earlier :) ), and the window does
open in this test.

However, what backend does this correspond to? I still get
errors when running Gtk or TkAgg.

JDO