[Guido] > > Second, what should happen to a slice assignment? [Ping] > My vote is: nothing! (Read on.) > > > The basic slice form is: > > > > a[i:j] += b > > What does this mean? I don't see how it could be any different from: > > a[j:j] = b Apparently you haven't used NumPy arrays (matrices). I haven't either, but I hear they overload + so that A+B is elementwise addition, and you can write A+1 to add 1 to each element of A. Thus, for a NumPy programmer, A += 1 would certainly look like A = A+1, and similar for A += B. > It looks to me like going through various contortions to support > augmented assignment to slices is not going to be worth the trouble. > > May i suggest > > >>> a[i:j] += b > SyntaxError: augmented assignment to a slice is not allowed That's what I thought too until I realized that for NumPy arrays slice+= makes sense. --Guido van Rossum (home page: http://www.pythonlabs.com/~guido/)
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