Add missing import to backend_tkagg.

anntzer · anntzer · commit 36ce1fa78d19 · 2018-01-09T19:05:49.000-08:00
diff --git a/lib/matplotlib/backends/backend_tkagg.py b/lib/matplotlib/backends/backend_tkagg.py
@@ -16,7 +16,7 @@
 import matplotlib.backends.windowing as windowing
 
 import matplotlib
-from matplotlib import backend_tools, rcParams
+from matplotlib import backend_tools, cbook, rcParams
 from matplotlib.backend_bases import (
     _Backend, FigureCanvasBase, FigureManagerBase, NavigationToolbar2,
     StatusbarBase, TimerBase, ToolContainerBase, cursors)
