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Sat Mar 3 00:38:50 CET 2012 · https://mail.python.org/pipermail/python-dev/2012-March/117255.html

On Sat, 03 Mar 2012 03:06:33 +0400, "Alex A. Naanou" <alex.nanou at gmail.com> wrote:
> Hi everyone,
> 
> Just stumbled on a fun little thing:
> 
> We create a simple structure...
> 
>   l = ([],)
> 
> 
> Now modify the list, and...
> 
>   l[0] += [1]
> 
> 
> ...we fail:
> ## Traceback (most recent call last):
> ##   File "F:\work\ImageGrid\cur\ImageGrid\src\test\python-bug.py",
> line 17, in <module>
> ##     l[0] += [1]
> ## TypeError: 'tuple' object does not support item assignment

What is even more fun is that the append actually worked (try printing
l).

This is not a bug, it is a quirk of how extended assignment works.
I think there's an issue report in the tracker somewhere that
discusses it.

--David

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[Python-Dev] odd "tuple does not support assignment" confusion...