Issue 6037: MutableSequence.__iadd__ should return self.

Issue 6037: MutableSequence.iadd should return self.
c384b226 · Raymond Hettinger · 93fb3aad · c384b226
Commit c384b226 authored May 18, 2009 by Raymond Hettinger
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Lib/_abcoll.py Lib/_abcoll.py +1 -0

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--- 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