function OnNetworkInstantiate (info : NetworkMessageInfo) {
if (networkView.isMine)
Debug.Log("New object instanted by me");
else
Debug.Log("New object instantiated by " + info.sender);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void OnNetworkInstantiate(NetworkMessageInfo info) {
if (networkView.isMine)
Debug.Log("New object instanted by me");
else
Debug.Log("New object instantiated by " + info.sender);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def OnNetworkInstantiate(info as NetworkMessageInfo):
if networkView.isMine:
Debug.Log('New object instanted by me')
else:
Debug.Log(('New object instantiated by ' + info.sender))