Index: IOBinding.py
===================================================================
--- IOBinding.py	(revision 56490)
+++ IOBinding.py	(working copy)
@@ -465,6 +465,18 @@
             self.text.insert("end-1c", "\n")
 
     def print_window(self, event):
+        m = tkMessageBox.Message(
+            title="Really print?",
+            message="Are you sure you want to print the window's contents?",
+            icon=tkMessageBox.QUESTION,
+            type=tkMessageBox.YESNO,
+            default=tkMessageBox.NO,
+            master=self.text)
+        reply = m.show()
+        if reply != tkMessageBox.YES:
+            self.text.focus_set()
+            return "break"
+
         tempfilename = None
         saved = self.get_saved()
         if saved: