fix a lot of Tkinter imports
diff --git a/Demo/tkinter/matt/entry-with-shared-variable.py b/Demo/tkinter/matt/entry-with-shared-variable.py
index c7cd259..473a596 100644
--- a/Demo/tkinter/matt/entry-with-shared-variable.py
+++ b/Demo/tkinter/matt/entry-with-shared-variable.py
@@ -1,4 +1,4 @@
-from Tkinter import *
+from tkinter import *
 import string
 
 # This program  shows how to make a typein box shadow a program variable.