a += b

is nominally the same as

a = a + b

To make class instances support this behavior the class can implement the
__iadd__ special method.  See docs.python.org and read about special
methods.

This notation originated, so far as I know, in the C language.  It at least
goes back that far.


On Mon, May 12, 2014 at 9:22 AM, Malik Rumi <malik.a.r...@gmail.com> wrote:

> I saw it here
> http://www.slideshare.net/jacobian/the-best-and-worst-of-django on slide
> 41. That's a lot to go through, I know, sorry about that. But I googled it
> and of course got nothing because Google ignores things like + and = now.
> And I know in this particular example he says 'don't do this", I just want
> to know what += means or does? Thx.
>
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