Why not a, b += i, j? (augmented assignment via tuple unpacking)

[Grant Edwards]

In article <as0p9f$3c7$1 at ginger.mathworks.com>, Joshua Marshall wrote:

>>> but the following is not legal:
>>> 
>>> a, b += i, j
>>> 
>>> Is there a reason that allowing this would be bad?
> 
>> If it were allowed, what do you propose it would do?
> 
> Maybe:
> 
>   a, b += i, j
> 
> is equivalent to
> 
>   tmp = j
>   a += i
>   b += tmp

To me, that would be a bit counter-intuitive, since

  ((a,b) + (i,j)) equals (a,b,i,j)  rather than   ((a+i),(b+j))

-- 
Grant Edwards                   grante             Yow!  I decided to be JOHN
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