def clear(self, page_size=10, vtimeout=10):
        n = 0
        l = self.get_messages(page_size, vtimeout)
        while l:
            for m in l:
                self.delete_message(m)
                n += 1
            l = self.get_messages(page_size, vtimeout)
        return n
par_loop arguments using an IterationIndex must use a local
dataset/ETHPy150Open darcyliu/storyboard/boto/sqs/queue.py/Queue.clear--crossover with--dataset/ETHPy150Open OP2/PyOP2/test/unit/test_indirect_loop.py/TestIndirectLoop.test_mismatching_itspace