Gregory Bond wrote: > I'm building a class hierarchy that needs to keep as a class variable a > reference to a (non-member) function, so that different subclasses can > use different generator functions. But it seems Python is treating the > function as a member function because the reference to it is in class > scope.... > > Here's a simple case of what I'm trying (in the real code, fn is a > function that returns a database connection relevant to that subclass): > >> def foo(): >> print "foo called" >> >> class S(object): >> fn = foo >> >> def bar(cls): >> cls.fn() >> bar = classmethod(bar) >> >> def foo2(): >> print "foo2 called" >> >> class D(S): >> fn = foo2 >> >> D.bar()
> I've tried playing with staticmethod() but I can't quite get it all > worked out... You are on the right track with staticmethod, but you have to apply it to fn: >>> def foo(): print "first foo" ... >>> def foo2(): print "second foo" ... >>> class S(object): ... fn = staticmethod(foo) ... def bar(cls): ... cls.fn() ... bar = classmethod(bar) ... >>> class D(S): ... fn = staticmethod(foo2) ... >>> S.bar() first foo >>> D.bar() second foo In its current form, the bar() method is not necessary: >>> S.fn() first foo >>> D.fn() second foo Peter -- http://mail.python.org/mailman/listinfo/python-list
