Tkinter, step 2: adapt imports.
diff --git a/Lib/idlelib/Debugger.py b/Lib/idlelib/Debugger.py
index 00aa4bb..ed66084 100644
--- a/Lib/idlelib/Debugger.py
+++ b/Lib/idlelib/Debugger.py
@@ -1,7 +1,7 @@
 import os
 import bdb
 import types
-from Tkinter import *
+from tkinter import *
 from idlelib.WindowList import ListedToplevel
 from idlelib.ScrolledList import ScrolledList
 from idlelib import macosxSupport