Tkinter rename, step 2: fix imports and add stub modules.
diff --git a/Lib/idlelib/AutoCompleteWindow.py b/Lib/idlelib/AutoCompleteWindow.py
index 635775d..ab132c1 100644
--- a/Lib/idlelib/AutoCompleteWindow.py
+++ b/Lib/idlelib/AutoCompleteWindow.py
@@ -1,7 +1,7 @@
 """
 An auto-completion window for IDLE, used by the AutoComplete extension
 """
-from Tkinter import *
+from tkinter import *
 from MultiCall import MC_SHIFT
 import AutoComplete