On Wed, Apr 2, 2008 at 7:30 AM, Nick Coghlan <[EMAIL PROTECTED]> wrote: > One of the issues with porting to Py3k is the problem that __getattr__ > and __getattribute__ can't reliably provide special methods like __add__ > the way __getattr__ could with classic classes. (As first noted by Terry > Reedy years ago, and recently seeing some new activity on the bug > tracker [1]) > > The culprit here is the fact that __getattribute__ and its associated > machinery is typically never invoked for the methods with dedicated tp_* > slots in the C-level type structure. > > What do people think of the idea of providing an extra method on type > objects that goes through all of the C-level special method slots, and > for each one that isn't currently set, does a getattr() on the > associated special name and stores the result (if any) on the current > type object? > > When converting a proxy class that relies on __getattr__ from classic to > new-style, all that would then be needed is to invoke the new method on > the class object after defining the class (a class decorator or > metaclass could be provided somewhere to make this a bit tidier). > > This seems a lot cleaner than expecting everyone that implements a proxy > object to maintain there own list of all of the relevant special > methods, and locates the implementation support in an area of the code > that already has plenty of infrastructure dedicated to keeping Python > visible attributes in sync with the C visible tp_* slots. > > Thoughts? Altenative ideas? Howls of protest? > > [1] http://bugs.python.org/issue643841
I've been wondering if we should provide a ProxyMixin that returned all the special methods to their old lookup behaviour. I think that'd be cleaner than providing a method to do it. Not sure how easy it'd be to implement though. -- Adam Olsen, aka Rhamphoryncus _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
