diff -r 8e1caaf567c4 Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py	Wed May 08 00:44:15 2013 +0200
+++ b/Lib/idlelib/PyShell.py	Wed May 08 01:59:04 2013 -0400
@@ -858,6 +858,8 @@
         text.bind("<<open-stack-viewer>>", self.open_stack_viewer)
         text.bind("<<toggle-debugger>>", self.toggle_debugger)
         text.bind("<<toggle-jit-stack-viewer>>", self.toggle_jit_stack_viewer)
+        text.bind("<Button-1>",self.buttonPress)
+        text.bind("<ButtonRelease-1>",self.buttonRelease)
         if use_subprocess:
             text.bind("<<view-restart>>", self.view_restart_mark)
             text.bind("<<restart-shell>>", self.restart_shell)
@@ -897,6 +899,14 @@
     closing = False
     _stop_readline_flag = False
 
+    def buttonPress(self, event):
+        # Disable mouse clicks in text area to prevent beginners from becoming
+        # confused.
+        return "break"
+
+    def buttonRelease(self,event):
+        return "break"
+
     def set_warning_stream(self, stream):
         global warning_stream
         warning_stream = stream