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import rclpy from rclpy.node import Node from std_msgs.msg import String class MinimalSubscriber(Node): def __init__(self): super().__init__('minimal_subscriber') self.subscription = self.create_subscription( String, 'topic', self.listener_callback, 10) self.subscription # prevent unused variable warning def listener_callback(self, msg): self.get_logger().info('I heard: "%s"' % msg.data) def main(args=None): rclpy.init(args=args) minimal_subscriber = MinimalSubscriber() rclpy.spin(minimal_subscriber) # Destroy the node explicitly # (optional - otherwise it will be done automatically # when the garbage collector destroys the node object) minimal_subscriber.destroy_node() rclpy.shutdown() if __name__ == '__main__': main()
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