django_recaptcha

from django.conf import settings     #for RECAPTCHA_PRIVATE key

def verify_recaptcha(request):
    import urllib, urllib2, re
    values = {
    "privatekey": settings.RECAPTCHA_PRIVATE,
    "remoteip": request.META['REMOTE_ADDR'],
    "challenge": request.POST['recaptcha_challenge_field'],
    "response": request.POST['recaptcha_response_field'],
    }
    url = "http://www.google.com/recaptcha/api/verify?%s" % (urllib.urlencode(values))
    o = urllib2.urlopen(url)
    if re.match("^true", o.readline()): return True
    else: return False