Coordinator try finally

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 x, y = reader.ptb_producer(raw_data, batch_size, num_steps)
    with self.test_session() as session:
      coord = tf.train.Coordinator()
      tf.train.start_queue_runners(session, coord=coord)
      try:
        xval, yval = session.run([x, y])
        print(xval)
        print(yval)
        self.assertAllEqual(xval, [[4, 3], [5, 6], [1, 0]])
        self.assertAllEqual(yval, [[3, 2], [6, 1], [0, 3]])
        xval, yval = session.run([x, y])
        print(xval)
        print(yval)
        self.assertAllEqual(xval, [[2, 1], [1, 1], [3, 4]])
        self.assertAllEqual(yval, [[1, 0], [1, 1], [4, 1]])
      finally:
        coord.request_stop()
        coord.join()