Argumentos anidados no compilando

Estoy tratando de compilar mi código en un módulo de Python 3. Funciona bien cuando elijo "Ejecutar módulo" en IDLE, pero recibo el siguiente error de sintaxis cuando intento crear una distribución:

File "/usr/local/lib/python3.2/dist-packages/simpletriple.py", line 9
    def add(self, (sub, pred, obj)):
                  ^
SyntaxError: invalid syntax

¿Alguien puede ayudar a señalar qué es lo que está mal con la sintaxis? Aquí está el código completo:

import csv

class SimpleGraph:
    def __init__(self):
        self._spo = {}
        self._pos = {}
        self._osp = {}

    def add(self, (sub, pred, obj)):
        """
        Adds a triple to the graph.
        """
        self._addToIndex(self._spo, sub, pred, obj)
        self._addToIndex(self._pos, pred, obj, sub)
        self._addToIndex(self._osp, obj, sub, pred)

    def _addToIndex(self, index, a, b, c):
        """
        Adds a triple to a specified index.
        """
        if a not in index: index[a] = {b:set([c])}
        else:
            if b not in index[a]: index[a][b] = set([c])
            else: index[a][b].add(c)

    def remove(self, (sub, pred, obj)):
        """
        Remove a triple pattern from the graph.
        """
        triples = list(self.triples((sub, pred, obj)))
        for (delSub, delPred, delObj) in triples:
            self._removeFromIndex(self._spo, delSub, delPred, delObj)
            self._removeFromIndex(self._pos, delPred, delObj, delSub)
            self._removeFromIndex(self._osp, delObj, delSub, delPred)

    def _removeFromIndex(self, index, a, b, c):
        """
        Removes a triple from an index and clears up empty indermediate structures.
        """
        try:
            bs = index[a]
            cset = bs[b]
            cset.remove(c)
            if len(cset) == 0: del bs[b]
            if len(bs) == 0: del index[a]
        # KeyErrors occur if a term was missing, which means that it wasn't a valid delete:
        except KeyError:
            pass

    def triples(self, (sub, pred, obj)):
        """
        Generator over the triple store.
        Returns triples that match the given triple pattern. 
        """
        # check which terms are present in order to use the correct index:
        try:
            if sub != None: 
                if pred != None:
                    # sub pred obj
                    if obj != None:
                        if obj in self._spo[sub][pred]: yield (sub, pred, obj)
                    # sub pred None
                    else:
                        for retObj in self._spo[sub][pred]: yield (sub, pred, retObj)
                else:
                    # sub None obj
                    if obj != None:
                        for retPred in self._osp[obj][sub]: yield (sub, retPred, obj)
                    # sub None None
                    else:
                        for retPred, objSet in self._spo[sub].items():
                            for retObj in objSet:
                                yield (sub, retPred, retObj)
            else:
                if pred != None:
                    # None pred obj
                    if obj != None:
                        for retSub in self._pos[pred][obj]:
                            yield (retSub, pred, obj)
                    # None pred None
                    else:
                        for retObj, subSet in self._pos[pred].items():
                            for retSub in subSet:
                                yield (retSub, pred, retObj)
                else:
                    # None None obj
                    if obj != None:
                        for retSub, predSet in self._osp[obj].items():
                            for retPred in predSet:
                                yield (retSub, retPred, obj)
                    # None None None
                    else:
                        for retSub, predSet in self._spo.items():
                            for retPred, objSet in predSet.items():
                                for retObj in objSet:
                                    yield (retSub, retPred, retObj)
        # KeyErrors occur if a query term wasn't in the index, so we yield nothing:
        except KeyError:
            pass

    def value(self, sub=None, pred=None, obj=None):
        for retSub, retPred, retObj in self.triples((sub, pred, obj)):
            if sub is None: return retSub
            if pred is None: return retPred
            if obj is None: return retObj
            break
        return None

    def load(self, filename):
        f = open(filename, "rb")
        reader = csv.reader(f)
        for sub, pred, obj in reader:
            sub = unicode(sub, "UTF-8")
            pred = unicode(pred, "UTF-8")
            obj = unicode(obj, "UTF-8")
            self.add((sub, pred, obj))
        f.close()

    def save(self, filename):
        f = open(filename, "wb")
        writer = csv.writer(f)
        for sub, pred, obj in self.triples((None, None, None)):
            writer.writerow([sub.encode("UTF-8"), pred.encode("UTF-8"), obj.encode("UTF-8")])
        f.close()

if __name__ == "__main__":
    g = SimpleGraph()
    g.add(("blade_runner", "name", "Blade Runner"))
    g.add(("blade_runner", "name", "Blade Runner"))
    g.add(("blade_runner", "release_date", "June 25, 1982"))
    g.add(("blade_runner", "directed_by", "Ridley Scott"))

    print list(g.triples((None, None, None)))
    print list(g.triples(("blade_runner", None, None)))
    print list(g.triples(("blade_runner", "name", None)))
    print list(g.triples(("blade_runner", "name", "Blade Runner")))
    print list(g.triples(("blade_runner", None, "Blade Runner")))
    print list(g.triples((None, "name", "Blade Runner")))
    print list(g.triples((None, None, "Blade Runner")))

    print list(g.triples(("foo", "name", "Blade Runner")))
    print list(g.triples(("blade_runner", "foo", "Blade Runner")))
    print list(g.triples(("blade_runner", "name", "foo")))

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