Tkinter rename, step 2: fix imports and add stub modules.
diff --git a/Lib/idlelib/Percolator.py b/Lib/idlelib/Percolator.py
index ebbcba9..21d8a47 100644
--- a/Lib/idlelib/Percolator.py
+++ b/Lib/idlelib/Percolator.py
@@ -81,5 +81,5 @@
     root.mainloop()
 
 if __name__ == "__main__":
-    from Tkinter import *
+    from tkinter import *
     main()