Slight metaclass confusion

David Mertz mertz at gnosis.cx
Wed Sep 10 20:02:14 CEST 2003


|mro = getattr(obj, "mro", None)
|if mro:
|	for i in mro:
|		func = getattr(i, "function")
|		if func:
|			return func(*args, **kw)
|#Fall through
|return getattr(type(obj), "function")(obj, *args, **kw)

Pretty much, but it looks like you have a couple errors in your example.
I think this is better (also undertested):

    def callmeth(obj, methname, *args, **kw):
        meth = obj.__dict__.get(methname)
        if meth is not None:            # Might be in object's dict
            return meth(*args, **kw)
        if hasattr(obj, "mro"):         # Might be in the ancestry
            for klass in obj.mro():
                meth = getattr(klass, methname)
                if meth is not None:
                    return meth(*args, **kw)
        # Or finally, look in class of obj
        return getattr(type(obj), methname)(*args, **kw)

I think this does roughly the right thing if a non-callable "meth" is
encountered.

Yours, David...

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