From c384b226d765d5f57a909df8da3f4fcdfb4b7246 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Mon, 18 May 2009 15:35:26 +0000
Subject: Issue 6037: MutableSequence.__iadd__ should return self.

---
 Lib/_abcoll.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index 7b01178..a60d91e 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -598,6 +598,7 @@ class MutableSequence(Sequence):
 
     def __iadd__(self, values):
         self.extend(values)
+        return self
 
 MutableSequence.register(list)
 MutableSequence.register(bytearray)  # Multiply inheriting, see ByteString
-- 
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