What does "+=" mean, or do?

[Malik Rumi]

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. 

[Tom Evans]

+ means addition
= means assignment
+= means addition and assignment

Eg, a += 5 means a = a + 5

Cheers

Tom

PS - the "don't do this" is not about "+="!

[Bill Freeman]

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....@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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[Malik Rumi]

Wow, really quick replies! thanks to both of you!