Rip out all the u"..." literals and calls to unicode().
diff --git a/Lib/idlelib/OutputWindow.py b/Lib/idlelib/OutputWindow.py
index 787e9b0..ae795e1 100644
--- a/Lib/idlelib/OutputWindow.py
+++ b/Lib/idlelib/OutputWindow.py
@@ -39,7 +39,7 @@
         # we assume that they are in the locale's encoding
         if isinstance(s, str):
             try:
-                s = unicode(s, IOBinding.encoding)
+                s = str(s, IOBinding.encoding)
             except UnicodeError:
                 # some other encoding; let Tcl deal with it
                 pass