# HG changeset patch
# User Ned Deily <nad@acm.org>
# Date 1341882971 25200
# Node ID 4f868af5a2d9ff11bbc62574cc215b4043e267c9
# Parent 7ed3b4f830c0366f1c7c65540e050fb1d4cd3c2b
Issue #4832: Modify IDLE to save files with .py extension by
default on Windows and OS X as it already does with X11 Tk.

diff --git a/Lib/idlelib/IOBinding.py b/Lib/idlelib/IOBinding.py
--- a/Lib/idlelib/IOBinding.py
+++ b/Lib/idlelib/IOBinding.py
@@ -485,6 +485,8 @@
         ("All files", "*"),
         ]
 
+    defaultextension = '.py' if sys.platform == 'darwin' else ''
+
     def askopenfile(self):
         dir, base = self.defaultfilename("open")
         if not self.opendialog:
@@ -508,8 +510,10 @@
     def asksavefile(self):
         dir, base = self.defaultfilename("save")
         if not self.savedialog:
-            self.savedialog = tkFileDialog.SaveAs(master=self.text,
-                                                  filetypes=self.filetypes)
+            self.savedialog = tkFileDialog.SaveAs(
+                    master=self.text,
+                    filetypes=self.filetypes,
+                    defaultextension=self.defaultextension)
         filename = self.savedialog.show(initialdir=dir, initialfile=base)
         return filename