def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def setdefault(self, key, default=None):
        return self._collection.setdefault(key, self._from_python(key, default))