UnityPostProcessSample.cs

using UnityEngine;
using UnityEditor;
using UnityEditor.Callbacks;
using System;
using System.Diagnostics;

public class PostBuildTrigger : MonoBehaviour {
	
	[PostProcessBuild(300)]
	public static void OnPostProcessBuild(BuildTarget target, string path)
	{
		if (target == BuildTarget.iPhone) {
			
			UnityEngine.Debug.Log("Python postprocess script");
			
			string unityPath = Application.dataPath;

			Process pythonProcess = new Process();
			pythonProcess.StartInfo.FileName = "pyhton";
			pythonProcess.StartInfo.Arguments = string.Format("/Assets/path/to/python/script.py \"{0}\" \"{1}\"", path, objCPath);
			pythonProcess.StartInfo.UseShellExecute = false;
			pythonProcess.StartInfo.RedirectStandardOutput = false;
			
			UnityEngine.Debug.Log(pythonProcess.StartInfo.Arguments);
			
			pythonProcess.Start ();
			pythonProcess.WaitForExit();
			
			UnityEngine.Debug.Log("Python script executed");
		}
	}
}