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Extending on Geoff's answer: bw is implemented slightly different to hz

Information on how these classes work can be found at rostopic.ROSTopicHz-class and rostopic.ROSTopicBandwidth-class

Extended Example:

import rospy, rostopic  
TOPIC = '/robot_pose'  
rospy.init_node('chosen_node_name')  

h = rostopic.ROSTopicHz(-1)  
s1 = rospy.Subscriber(TOPIC, rospy.AnyMsg, h.callback_hz, callback_args=TOPIC)  
rospy.sleep(1)  
h.print_hz([TOPIC])  

b = rostopic.ROSTopicBandwidth()  
s2 = rospy.Subscriber(TOPIC, rospy.AnyMsg, b.callback)  
rospy.sleep(1)  
b.print_bw()