--- a/graphics/RubberBand.py	Fri Sep 22 20:12:22 2017 +0300
+++ b/graphics/RubberBand.py	Thu Sep 28 12:20:40 2017 +0300
@@ -32,7 +32,7 @@
 # -------------------------------------------------------------------------------
 
 
-class RubberBand:
+class RubberBand(object):
     """
     Class that implements a rubberband for graphic Viewers
     """