Diez B. Roggisch deets at nospam.web.de
Tue Oct 9 16:27:47 EDT 2007

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Steven D'Aprano schrieb:
> On Tue, 09 Oct 2007 19:23:37 +0200, Diez B. Roggisch wrote:
> 
>> Your believes aside, this is simply wrong. The statement
>>
>> a += x
>>
>> always leads to a rebinding of a to the result of the operation +.
> 
> Not true.


Yes, it is.

>>>> L = []
>>>> id(L)
> 3083496716L
>>>> L += [1]
>>>> id(L)
> 3083496716L
> 
> It's the same L, not rebound at all.

Just because the __iadd__-operation in the list implemented chose to 
returen a reference to itself - certainly a sensible choice, I never 
doubted that - doesn't change the fact that python rebinds the name on 
the left with whatever __iadd__ returned.

Diez

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