MNT: remove unused import

tacaswell · tacaswell · commit d2c9e35eeeb0 · 2016-02-16T23:44:53.000-05:00
The comment says that this is used by IPython (circa 2008) however it's
use was removed from the IPython code base in

770734dc47d57cdebc365fcbcd313e76a22be89d
Author: Brian Granger &lt;ellisonbg@gmail.com&gt;  2009-07-21 15:28:37

which Precedes: rel-0.11 so no supported version of IPython still
has this code.
diff --git a/lib/matplotlib/backends/__init__.py b/lib/matplotlib/backends/__init__.py
@@ -7,9 +7,6 @@
 import inspect
 import warnings
 
-# ipython relies on interactive_bk being defined here
-from matplotlib.rcsetup import interactive_bk
-
 
 def pylab_setup():
     'return new_figure_manager, draw_if_interactive and show for pylab'
