Robert Kern wrote:
> From the reference manual:
>
> http://docs.python.org/ref/augassign.html
>
> """An augmented assignment expression like x += 1 can be rewritten as x = x +
> 1
> to achieve a similar, but not exactly equal effect. In the augmented version,
> x
> is only evaluated once. Also, when possible, the actual operation is
> performed
> in-place, meaning that rather than creating a new object and assigning that
> to
> the target, the old object is modified instead."""
I've always thought this was a mistake -- it is a source of weird errors
and bugs. AFAIC, the augmented assignments should ONLY work with mutable
objects, and ALWAYS do the operation in place.
But then you couldn't write:
i = 1
i += 1
Because python numbers are immutable. I think the problem here is that
augmented assignment is solving two distinct problems: in place
operations and nice syntax for incrementing.
Oh well, it's not that big a deal, and usually the confusion causes
errors that show up right away.
-Chris
--
Christopher Barker, Ph.D.
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