4 from std_srvs.srv 
import Empty
 
    5 from std_srvs.srv 
import EmptyRequest
 
    8 if __name__ == 
"__main__":
 
    9     rospy.init_node(
"sample_pointcloud_localization_client")
 
   10     rospy.wait_for_service(
'~localize')
 
   11     localize_client = rospy.ServiceProxy(
'~localize', Empty)
 
   12     r = rospy.Rate(rospy.get_param(
'~request_rate', 1.0))
 
   14     while not rospy.is_shutdown():
 
   20         except rospy.ROSTimeMovedBackwardsException: