Preventing comment spam

django_settings.py

COMMENTS_SECRET = 'any_old_string_you_like'

form_fields.html

<input type="hidden" name="comment-secret" id="id_comment-secret" />

<textarea id="id_comment-body" rows="10" cols="40" name="comment-body"></textarea>

javascript.js

<script type="text/javascript">
  $('textarea#id_comment-body').keypress(function() {
    setTimeout(function(){
      $('input#id_comment-secret').attr('value', '{% setting 'COMMENTS_SECRET' %}')
    }, 
    5000)
  });
</script>

test_for_match.py

def clean(self):
  if not self.request.POST.get('comment-secret', '') == settings.COMMENTS_SECRET:
    raise forms.ValidationError("This site thinks you're a spammer. If you're not, wait a few seconds after typing your comment before you submit it.")
  return self.cleaned_data