def get_examples(self, string, name='<string>'):
        return [x for x in self.parse(string, name)
                if isinstance(x, Example)]
From http://recaptcha.net/apidocs/captcha/#look-n-feel:
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/test/_doctest.py/DocTestParser.get_examples--crossover with--dataset/ETHPy150Open albatrossandco/brubeck_cms/brubeck/core/emailing/recaptcha.py/RecaptchaWidget.__init__