imperative_to_declarative.py

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#!/usr/bin/env python
import roslib; roslib.load_manifest('imperative_to_declarative')
import rospy
from std_msgs.msg import String

def youinate(msg, pub):
    instr = msg.data
    outstr = "You " + instr[0].lower() + instr[1:]
    s = String()
    s.data = outstr
    pub.publish(s)

def main():
    rospy.init_node('imperative_to_declarative')
    pub = rospy.Publisher('declarative', String)
    rospy.Subscriber('imperative', String, lambda msg: youinate(msg, pub))
    rospy.spin()

if __name__ == '__main__':
    main()