using super

[Steven D'Aprano]

On Mon, 31 Dec 2007 05:47:31 -0800, iu2 wrote:

> Hi
> 
> I'm trying to make a method call automatically to its super using this
> syntax:

[snip code]


I'm not sure if this is your only problem or not, but super() only works 
with new-style classes, not with classic classes. You must inherit from 
object, or it cannot possibly work.

Change "class A" to "class A(object)".

However, I suspect your approach may be too complicated. Try this:


def chain(meth):  # A decorator for calling super.
    def f(self, *args, **kwargs):
        result = meth(self, *args, **kwargs)
        S = super(self.__class__, self)
        getattr(S, meth.__name__)(*args, **kwargs)
        return result
    f.__name__ = "chained_" + meth.__name__
    return f



class A(object):
    def foo(self, x):
        print "I am %s" % self
        return x

class B(A):
    @chain
    def foo(self, x):
            print "This is B!!!"
            return x + 1



>>> a = A()
>>> a.foo(5)
I am <__main__.A object at 0xb7cf676c>
5
>>> b = B()
>>> b.foo(5)
This is B!!!
I am <__main__.B object at 0xb7cf68ac>
6



-- 
Steven