Piet van Oostrum wrote: >>>>>> [EMAIL PROTECTED] (T) wrote: > >>T> As you can see, the "constant" A can be modified this easily. But if >>T> there were an intuitive mechanism to declare a symbol to be immutable, >>T> then there won't be this problem. > > Mutability is not a property of symbols but of values. So it doesn't make > sense to declare an identifier to be immutable. And mutability is tied to > the object's type, not to individual instances.
I think he meant immutable binding, not immutable symbol. So rebinding/overshadowing a "constant" A would raise an error, but mutating the underlying object A refers to would not (unless it too were immutable). As far objects themselves, adding an ability to make any object immutable regardless of type is exactly what he suggests. -- Edward Elliott UC Berkeley School of Law (Boalt Hall) complangpython at eddeye dot net -- http://mail.python.org/mailman/listinfo/python-list
