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Tue Feb 10 09:27:50 CET 2015 · https://mail.python.org/pipermail/python-dev/2015-February/138117.html

On Tue, 10 Feb 2015 19:04:03 +1300
Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Donald Stufft wrote:
> > 
> > perhaps a better 
> > solution is to simply make it so that something like ``a_list + 
> > an_iterable`` is valid and the iterable would just be consumed and +’d 
> > onto the list.
> 
> I don't think I like the asymmetry that this would
> introduce into + on lists. Currently
> 
>     [1, 2, 3] + (4, 5, 6)
> 
> is an error because it's not clear whether the
> programmer intended the result to be a list or
> a tuple.

>>> bytearray(b"a") + b"bc"
bytearray(b'abc')
>>> b"a" + bytearray(b"bc")
b'abc'

It's quite convenient. In many contexts lists and tuples are quite
interchangeable (for example when unpacking).

Regards

Antoine.

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