> > Well I find this a confusing behaviour on python's part. The fact > that instance.field can mean something different, depending on > where in a statement you find it, makes the behaviour inconsistent. > > I know people in general here are against declarations, but declarations > could IMO provide more consistency here and thus more obvious behaviour.
Well just to show how confusing python can be, the following piece of code. | class Spam: | eggs = [2, 3] | | | sp1 = Spam() | sp2 = Spam() | | print sp1.eggs, id(sp1.eggs) | print sp2.eggs, id(sp2.eggs) | print '--------------------' | | sp1.eggs += [4,] | | print sp1.eggs, id(sp1.eggs) | print sp2.eggs, id(sp2.eggs) | print '--------------------' | | Spam.eggs = [3,5] | | print sp1.eggs, id(sp1.eggs) | print sp2.eggs, id(sp2.eggs) | print '--------------------' Which produces: [2, 3] 1075958860 [2, 3] 1075958860 -------------------- [2, 3, 4] 1075958860 [2, 3, 4] 1075958860 -------------------- [2, 3, 4] 1075958860 [3, 5] 1075959084 -------------------- -- http://mail.python.org/mailman/listinfo/python-list
