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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load_stream(self, stream):
 """ Load a stream of un-ordered Arrow RecordBatches, where the last iteration yields a list of indices that can be used to put the RecordBatches in the correct order. """

        # load the batches
        for batch in self.serializer.load_stream(stream):
            yield batch

        # load the batch order indices
        num = read_int(stream)
        batch_order = []
        for i in xrange(num):
            index = read_int(stream)
            batch_order.append(index)
        yield batch_order