rosservice geometry_msgs/Posearray example

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This is definitely possible. You would need to create your custom service which will contain the pose array msg as a response. A service description file consists of a request and a response msg type. Since in your case you just need to receive the array on a service call you will not need a request (it will act as trigger srv) and the response should contain the pose array. For example this can be your bare bone service description:

---
geometry_msgs/PoseArray arr

You can name this srv file as getPoseArray.srv (check again the service creation tutorial for this).

The geometry_msgs/PoseArray msg contains a header and array of poses. When you create/save the array of poses in script1.py (I guess you are using a global variable for this, for example my_array) and you can also populate the header (especially the frame_id since you are dealing with poses). You will need to advertise the service where in the service callback you will just return the pose array (check again the service/client tutorials)). In python it will look something like this:

#!/usr/bin/env python

import rospy
from your_package.srv import getPoseArray
from geometry_msgs.msg import PoseArray

def handle_get_pose_array(req):
    return getPoseArrayResponse(my_array)

def get_pose_array_server():
    rospy.init_node('get_pose_array_server')
    s =rospy.Service('get_pose_array', getPoseArray, handle_get_pose_array)

   my_array = PoseArray()
   my_array.header.frame_id = some_frame
   my_array.poses = ... # assign/populate here

    rospy.spin()

if __name__ == "__main__":
    get_pose_array_server()

On the other side in script2.py you need to create the client and call the service:

#!/usr/bin/env python

import rospy
from your_package.srv import getPoseArray
from geometry_msgs.msg import PoseArray

def get_pose_array_client():
    rospy.wait_for_service('get_pose_array')
    try:
        client_handle = rospy.ServiceProxy('get_pose_array', getPoseArray)
        resp1 = client_handle()
        return resp1.arr
    except rospy.ServiceException, e:
        print "Service call failed: %s"%e

if __name__ == "__main__":
    get_pose_array_client()