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Hello,

I had formatted your code got something like this:

#!/usr/bin/env python

import rospy
from std_msgs.msg import String
from std_msgs.msg import Int16
from myworkcell.msg import message1
from myworkcell.srv import LocalizePart
from fake_ar_publisher.msg import ARMarker
import random

received_pose=ARMarker()

def callback(data):
    #print "receiving data"
    received_pose.pose=data.pose
    # # print "received_pose"

def handle_service2(req):
    print "in the response"
    #req.base_frame=received_pose
    rospy.loginfo(rospy.get_caller_id() + "I heard %s", received_pose.pose)
    print "Im here"
    return LocalizePartResponse(received_pose.pose)

def vision_node_service_server_2():
    rospy.init_node('myworkcell_node', anonymous=True)
    #ROS_INFO("ScanNPlan node has been initialized");
    #print "about to subscribe"
    rospy.Subscriber('ar_pose_marker',ARMarker, callback)
    print "hereeeee"
    #print "subscribed"
    #ROS_INFO("I'm subscribed to fake_ar_publisher");
    #s=rospy.Service('localize_part',LocalizePart,handle_service2)
    s=rospy.Service('Localize_Part',LocalizePart,handle_service2)
    #print"I'm here already"
    rospy.spin()

if __name__ == '__main__':
    try:
        vision_node_service_server_2()
    except rospy.ROSInterruptException:
        pass

Finally, I've reproduced your problem and concluded that to solve it you only have to import the server response library.

ROS creates 3 classes for each service message: Service definition, Request message and Response message. You should take a look here: http://wiki.ros.org/rospy/Overview/Services

Following the code I've posted, I had just to replace this:

from myworkcell.srv import LocalizePart

with this:

from myworkcell.srv import LocalizePart, LocalizePartResponse

I hope it can help you!