Return value of an assignment statement?
steve at holdenweb.com
Sat Feb 23 14:31:11 CET 2008
Paul Rubin wrote:
> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>> Personally, I think the confusion of augmented assignments is not worth
>> the benefit of saving typing a couple of characters. I think Guido's
>> first decision, to leave += etc out of the language, was the right
> It quite helpful to be able to say
> foo['bar'+lookup(baz)][blob(a)+frob(b)] += 1
> without having to split it into separate statements to avoid repeating
> the function calls and their possible side effects.
And that was the reason for eventually including them. I remember being
very surprised when I learned that rebinding was possible at the option
of the implementing object, but of course rebinding is inevitable when
you have immutable objects that implement augmented assignments.
Steve Holden +1 571 484 6266 +1 800 494 3119
Holden Web LLC http://www.holdenweb.com/
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