fix some imports
diff --git a/Tools/scripts/redemo.py b/Tools/scripts/redemo.py
index b9bfb96..5286332 100644
--- a/Tools/scripts/redemo.py
+++ b/Tools/scripts/redemo.py
@@ -1,6 +1,6 @@
 """Basic regular expression demostration facility (Perl style syntax)."""
 
-from Tkinter import *
+from tkinter import *
 import re
 
 class ReDemo: