Verify transaction Receipt (Server, python)

#!/usr/bin/env python

import sys
import json
import base64
import urllib2

liveURL = 'https://buy.itunes.apple.com/verifyReceipt'
sandboxURL = 'https://sandbox.itunes.apple.com/verifyReceipt'
URL = sandboxURL

def main():
 if len(sys.argv) < 2:
  print 'USAGE: verifyReceipt RECEIPT'
  sys.exit()

 with open(sys.argv[1]) as f:
  verifyReceipt(f.read())

def verifyReceipt(receipt):
 receiptData = base64.b64encode(receipt)
 jsonData = json.dumps({'receipt-data': receiptData})

 s = urllib2.urlopen(URL, jsonData)
 responseData = s.read()
 s.close()

 responseJSON = json.loads(responseData)
 print json.dumps(responseJSON, sort_keys=True, indent=4)
      stattus = responseJSON.get_data("status","unknown")


if __name__ == '__main__':
 main()