`
# settings.py

RECAPTCHA_PUB_KEY = "your public key"
RECAPTCHA_PRIVATE_KEY = "your private key"


# urls.py

from django.conf.urls.defaults import *

urlpatterns = patterns('',
        (r'^contact/$', 'myproject.myapp.views.contact'),
)


# views.py

from django.shortcuts import render_to_response
from django.http import HttpResponseRedirect
from django import newforms as forms
from django.conf import settings
import captcha

class ContactForm(forms.Form):
    message = forms.CharField()

def contact(request):
    if request.method == 'POST':
        # Check the captcha
        check_captcha = captcha.submit(request.POST['recaptcha_challenge_field'], request.POST['recaptcha_response_field'], settings.RECAPTCHA_PRIVATE_KEY, request.META['REMOTE_ADDR'])
        if check_captcha.is_valid is False:
            # Captcha is wrong show a error ...
            return HttpResponseRedirect('/url/error/')
        form = ContactForm(request.POST)
        if form.is_valid():
            # Do form processing here...
            return HttpResponseRedirect('/url/on_success/')
    else:
        form = ContactForm()
        html_captcha = captcha.displayhtml(settings.RECAPTCHA_PUB_KEY)
    return render_to_response('contact.html', {'form': form, 'html_captcha': html_captcha})


# contact.html

<form method="post" action="">
        {{ form.as_p }}
        {{ html_captcha }}
<input type="submit" />
</form>
`