add example using serversocket from https://docs.python.org/2/library/socketserver.html

socketserver/UdpServer.py

@@ -0,0 +1,21 @@
+import SocketServer
+
+class MyUDPHandler(SocketServer.BaseRequestHandler):
+    """
+    This class works similar to the TCP handler class, except that
+    self.request consists of a pair of data and client socket, and since
+    there is no connection the client address must be given explicitly
+    when sending data back via sendto().
+    """
+
+    def handle(self):
+        data = self.request[0].strip()
+        socket = self.request[1]
+        print "{} wrote:".format(self.client_address[0])
+        print data
+        socket.sendto(data.upper(), self.client_address)
+
+if __name__ == "__main__":
+    HOST, PORT = "localhost", 9999
+    server = SocketServer.UDPServer((HOST, PORT), MyUDPHandler)
+    server.serve_forever()