Op 2005-11-03, Steven D'Aprano schreef <[EMAIL PROTECTED]>: > On Thu, 03 Nov 2005 11:55:06 +0000, Antoon Pardon wrote: > >> No matter wat the OO model is, I don't think the following code >> exhibits sane behaviour: >> >> class A: >> a = 1 >> >> b = A() >> b.a += 2 >> print b.a >> print A.a >> >> Which results in >> >> 3 >> 1 > > Seems perfectly sane to me. > > What would you expect to get if you wrote b.a = b.a + 2?
I would expect a result consistent with the fact that both times b.a would refer to the same object. > Why do you expect > b.a += 2 to give a different result? I didn't know I did. > Since ints are immutable objects, you shouldn't expect the value of b.a > to be modified in place, and so there is an assignment to b.a, not A.a. You are now talking implementation details. I don't care about whatever explanation you give in terms of implementation details. I don't think it is sane that in a language multiple occurence of something like b.a in the same line can refer to different objects I think it even less sane, if the same occurce of b.a refers to two different objects, like in b.a += 2 -- Antoon Pardon. -- http://mail.python.org/mailman/listinfo/python-list
