template_pub.py

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#!/usr/bin/env python
import rospy
from std_msgs.msg import String


def talker():
    pub = rospy.Publisher('chatter', String)
    rospy.init_node('talker')
    while not rospy.is_shutdown():
        str = "Hello World %s" % rospy.get_time()
        rospy.loginfo(str)
        pub.publish(String(str))
        rospy.sleep(1.0)


if __name__ == '__main__':
    try:
        talker()
    except rospy.ROSInterruptException:
        pass