Run 2to3 over the Demo/ directory to shut up parse errors from 2to3 about lingering print statements.
diff --git a/Demo/tkinter/matt/animation-w-velocity-ctrl.py b/Demo/tkinter/matt/animation-w-velocity-ctrl.py
index e676338..68eb1d0 100644
--- a/Demo/tkinter/matt/animation-w-velocity-ctrl.py
+++ b/Demo/tkinter/matt/animation-w-velocity-ctrl.py
@@ -8,7 +8,7 @@
 
 class Test(Frame):
     def printit(self):
-        print "hi"
+        print("hi")
 
     def createWidgets(self):
         self.QUIT = Button(self, text='QUIT', foreground='red',