fix a lot of Tkinter imports
diff --git a/Demo/tkinter/matt/pong-demo-1.py b/Demo/tkinter/matt/pong-demo-1.py
index 7fcf800..09f9f2e 100644
--- a/Demo/tkinter/matt/pong-demo-1.py
+++ b/Demo/tkinter/matt/pong-demo-1.py
@@ -1,4 +1,4 @@
-from Tkinter import *
+from tkinter import *
 
 import string