From 3b3ddb882885042c71b9cabdadbd4d47a71b83a9 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Mon, 18 May 2009 15:56:38 +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 a355be9a79..d8cdc98c4c 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -557,5 +557,6 @@ class MutableSequence(Sequence):
 
     def __iadd__(self, values):
         self.extend(values)
+        return self
 
 MutableSequence.register(list)
-- 
2.50.1