Tkinter rename, step 2: fix imports and add stub modules.
diff --git a/Lib/idlelib/ObjectBrowser.py b/Lib/idlelib/ObjectBrowser.py
index 8ff0041..c328cdc 100644
--- a/Lib/idlelib/ObjectBrowser.py
+++ b/Lib/idlelib/ObjectBrowser.py
@@ -136,7 +136,7 @@
 
 def _test():
     import sys
-    from Tkinter import Tk
+    from tkinter import Tk
     root = Tk()
     root.configure(bd=0, bg="yellow")
     root.focus_set()