USCIS OPT application status query

opt.py

#!/usr/bin/env python
# vim: set fileencoding=utf-8 ts=4 sw=4 tw=79 :

from __future__ import (unicode_literals, absolute_import,
                        division, print_function)

import requests
from lxml import etree
from io import StringIO

payload = {
    'appReceiptNum': 'SRC1490207645',
}

if __name__ == '__main__':
    s = requests.session()
    s.get('https://egov.uscis.gov/cris/Dashboard/CaseStatus.do', verify=False)
    ret = s.post('https://egov.uscis.gov/cris/Dashboard/CaseStatus.do',
                 data=payload, verify=False)

    tree = etree.parse(StringIO(ret.text), etree.HTMLParser())
    n = tree.xpath("//div[@id='caseStatus']"
                   "/div[@class='controls']"
                  "/h4/br")
    status = n[0].tail.strip()
    if status != 'Initial Review':
        print(status)