From db2517c66ae9258dc892ee6235cdd9669d269db1 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Mon, 18 May 2009 15:49:55 +0000
Subject: [PATCH] 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 73966dbce6b6..16d85b44dc9b 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -595,6 +595,7 @@ class MutableSequence(Sequence):
 
     def __iadd__(self, values):
         self.extend(values)
+        return self
 
 MutableSequence.register(list)
 MutableSequence.register(bytearray)  # Multiply inheriting, see ByteString
-- 
2.47.3