From f9607821ade54ec75d8d91952b64ecf1bfde4923 Mon Sep 17 00:00:00 2001
From: Fred Drake <fdrake@acm.org>
Date: Thu, 17 Jun 1999 15:18:47 +0000
Subject: [PATCH] open():  Make the mode parameter optional; if omitted or
 None, use the 	 mode attribute of the file object (if it has one), otherwise 
  use 'rb'.

	 The documentation should still show this as required until
	 there's a new release.
---
 Lib/wave.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Lib/wave.py b/Lib/wave.py
index 1353b51b376..5344db2aeb9 100644
--- a/Lib/wave.py
+++ b/Lib/wave.py
@@ -555,7 +555,12 @@ class Wave_write:
 		self._file.seek(curpos, 0)
 		self._datalength = self._datawritten
 
-def open(f, mode):
+def open(f, mode=None):
+	if mode is None:
+		if hasattr(f, 'mode'):
+			mode = f.mode
+		else:
+			mode = 'rb'
 	if mode in ('r', 'rb'):
 		return Wave_read(f)
 	elif mode in ('w', 'wb'):