Rip out all the u"..." literals and calls to unicode().
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 7753f2d..248a702 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -3736,7 +3736,7 @@
     text = "This is Tcl/Tk version %s" % TclVersion
     if TclVersion >= 8.1:
         try:
-            text = text + unicode("\nThis should be a cedilla: \347",
+            text = text + str("\nThis should be a cedilla: \347",
                                   "iso-8859-1")
         except NameError:
             pass # no unicode support