Django parsing exchange

from lxml import etree
from django.http import HttpResponse
import os
import urllib2
from datetime import date

def cursvalutar(request):
    d = date.today()
    t = d.strftime("%d.%m.%Y")

    if not os.path.exists(r'd:\mydjango\cursvalutar\rates-%s.xml' % t):
      file = urllib2.urlopen("http://bnm.md/md/official_exchange_rates?get_xml=1&date=%s" % t)
      data = file.read()
      file.close()
      out_file = open((r'd:\mydjango\cursvalutar\rates-%s.xml' % t), 'w')
      out_file.write(data)


    xmlFile = (r'd:\mydjango\cursvalutar\rates-%s.xml' % t)
    doc = etree.parse(xmlFile)
    dolar = doc.xpath('/ValCurs/Valute/CharCode[text()="USD"]/../Value/text()')[0]
    euro = doc.xpath('/ValCurs/Valute/CharCode[text()="EUR"]/../Value/text()')[0]

    return HttpResponse('Cursul valutar pentru Dolar: %s\nCursul valutar pentru Euro: %s' % (dolar, euro))