class Test(object):
    def __init__(self, val, u=False):
        self.val = val
        if u:
            self.__unicode__ = self._do_uni

    def __unicode__(self):
        return 'blah!'
    def _do_uni(self):
        return unicode(self.val)

if __name__ == "__main__":
    print unicode(Test('u', True))
    print unicode(Test('s', False))