How can I use multiple subscriber for only one publisher?

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Hi Everybody,

I am really new to Ros and I have tried to read the position of the robot (x,y) to see in real-time. I have this code, but it's just don't do it. I would really appreciate any help. Thanks

class MoveRobot:
    def __init__(self):
        rospy.init_node('move_the_robot',anonymous=True)
        self.pub = rospy.Publisher('/miro/control/cmd_vel',TwistStamped, queue_size=1)
        self.sub = rospy.Subscriber('/miro/sensors/package', sensors_package, self.callback)
        self.sub_position = ros.Subscriber('/miro/sensors/odom', Odometry, self.call_position)
        self.rate = rospy.Rate(10)
        self.move = TwistStamped()

    def callback(self,msg):
        self.pub.publish(self.move)
        self.sonar_sensor = msg
        print(msg.sonar.range)

    def read_sonar(self):
        return self.sonar_sensor.sonar.range

    def call_position(self)
        self.x = msg.pose.pose.position.x
        self.y = msg.pose.pose.position.y
        #rospy.loginfo('x: {}, y: {}'.format(x,y))

    def get_position(self):
        return self.position_x.pose.pose.position.x

    def move_forward(self,x,z):
        while not rospy.is_shutdown():
            self.move.twist.linear.x = 0.5
            self.move.twist.angular.z = 0.0
            self.rate.sleep()

mr = MoveRobot()
mr.move_forward(0.5,0.0)

I would like to see the x and y position of the robot in real-time. I would like to return these two sensor data to see where is the robot in the x,y plane. I am trying to do a reinforcement learning and my teacher said that I need to know the grid, so I guess this is the way to figure it out.