Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> writes: > On Fri, 01 Apr 2011 09:14:03 +1100, Ben Finney wrote: > > > I want to inherit from a class, and define aliases for many of its > > attributes. > > Are these aliases of arbitrary aliases, or only of methods, as in your > example below?
I'd like to know how to do either, for making API wrapper classes. > > How can I refer to “the attribute that will be available by > > name ‘spam’ once this class is defined”? > > You might be able to use the descriptor protocol to do something like > that, but otherwise I don't think you can. However, I note that your > example isn't *quite* how you describe it above. Yes, I got the names wrong. The example is accurate to what I'm meaning to say. > > class Foo(object): > > def spam(self): > > pass > > def eggs(self): > > pass > > > > class Bar(Foo): > > beans = Foo.spam > > mash = Foo.eggs > > This assigns the name Bar.beans to the method object Foo.spam. If you > now rebind the name Foo.spam to something else, Bar.beans will not > likewise change, but will continue to refer to the original. This is > contrary to your earlier description, where Bar.beans should also > change. Hmm. I think I can live with that limitation. > > Is that the right way to do it? Will that leave me open to “unbound > > method” or “is not an instance of ‘Bar’” or other problems when > > using ‘Bar.beans’? > > I don't believe so. So long as you don't rebind the "alias" or the > original, you should be fine. Okay, thank you. -- \ “I am too firm in my consciousness of the marvelous to be ever | `\ fascinated by the mere supernatural …” —Joseph Conrad, _The | _o__) Shadow-Line_ | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
