Custom Initialization for running standalone PyQGIS processing.

qgis_custom_init.py

'''
Standalone QGIS Initilization Script for QGis running on Mac OS X
'''
import os
import sys

#Implicitly define where plugins are for QGIS
sys.path.append('/Applications/QGis.app/Contents/Resources/python/')
sys.path.append('/Applications/QGis.app/Contents/Resources/python/plugins')

#Import QGIS
from qgis.core import *

#If we don't initialize the app, it will crash
app = QgsApplication([],True)
QgsApplication.setPrefixPath(r"/Applications/QGIS.app/Contents/Plugins", True)
QgsApplication.initQgis()

import PyQt4
from PyQt4 import QtCore, QtGui

#Most important module:
import processing