diff -r 87c6be1e393a Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py	Fri Dec 09 01:20:03 2011 +0100
+++ b/Lib/idlelib/PyShell.py	Thu Dec 08 19:19:08 2011 -0600
@@ -811,7 +811,7 @@
         OutputWindow.__init__(self, flist, None, None)
         #
 ##        self.config(usetabs=1, indentwidth=8, context_use_ps1=1)
-        self.usetabs = True
+        self.usetabs = False
         # indentwidth must be 8 when using tabs.  See note in EditorWindow:
         self.indentwidth = 8
         self.context_use_ps1 = True