Run 2to3 over the Demo/ directory to shut up parse errors from 2to3 about lingering print statements.
diff --git a/Demo/tkinter/guido/ShellWindow.py b/Demo/tkinter/guido/ShellWindow.py
index 104e06d..d7e0a0e 100755
--- a/Demo/tkinter/guido/ShellWindow.py
+++ b/Demo/tkinter/guido/ShellWindow.py
@@ -37,7 +37,7 @@
         if not data:
             self.tk.deletefilehandler(file)
             pid, sts = os.waitpid(self.pid, 0)
-            print 'pid', pid, 'status', sts
+            print('pid', pid, 'status', sts)
             self.pid = None
             detail = sts>>8
             cause = sts & 0xff