def some_decorator(func):
    def decorator(self, *args, **kwargs):
        print 'instance %s of class %s is now decorated whee!' % (
            self, self.__class__
        )
        return func(*args, **kwargs)

    return decorator

class SomeClass(object):
    @some_decorator
    def dostuff(self, foo, bar):
        print 'do %s, %s' % (foo, bar)

class SomeDecorator(object):
    def __init__(self, func):
        self.func = func

    def __call__(self, *args, **kwargs):
        print 'instance %s of class %s this is now decorated whee!' % (
            self.obj, self.cls
        )
        return self.func.__call__(*args, **kwargs)

    def __get__(self, instance, owner):
        self.cls = owner
        self.obj = instance

        return self.__call__

class SomeClass(object):
    @SomeDecorator
    def dostuff(self, foo, bar):
        print 'do %s, %s' % (foo, bar)