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Wed Feb 11 12:22:22 CET 2015 · https://mail.python.org/pipermail/python-dev/2015-February/138153.html

On Wed, 11 Feb 2015 18:45:40 +1300
Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Antoine Pitrou wrote:
> >>>>bytearray(b"a") + b"bc"
> > 
> > bytearray(b'abc')
> > 
> >>>>b"a" + bytearray(b"bc")
> > 
> > b'abc'
> > 
> > It's quite convenient.
> 
> It's a bit disconcerting that the left operand wins,
> rather than one of them being designated as the
> "wider" type, as occurs with many other operations on
> mixed types, e.g. int + float.

There is no "wider" type here. This behaviour is perfectly logical.

> In any case, these seem to be special-case combinations.

No:

>>> b"abc" + array.array("b", b"def")
b'abcdef'
>>> bytearray(b"abc") + array.array("b", b"def")
bytearray(b'abcdef')

Regards

Antoine.

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