Tkinter, step 2: adapt imports.
diff --git a/Lib/idlelib/Percolator.py b/Lib/idlelib/Percolator.py
index 80140d0..c91de38 100644
--- a/Lib/idlelib/Percolator.py
+++ b/Lib/idlelib/Percolator.py
@@ -52,7 +52,7 @@
             filter.setdelegate(None)
 
 def main():
-    import Tkinter as Tk
+    import tkinter as Tk
     class Tracer(Delegator):
         def __init__(self, name):
             self.name = name