fields.py 文件源码

def fetch_captcha_store(self, name, value, attrs=None):
        """
        Fetches a new CaptchaStore
        This has to be called inside render
        """
        try:
            reverse('captcha-image', args=('dummy',))
        except NoReverseMatch:
            raise ImproperlyConfigured('Make sure you\'ve included captcha.urls as explained in the INSTALLATION section on http://readthedocs.org/docs/django-simple-captcha/en/latest/usage.html#installation')

        key = CaptchaStore.generate_key()

        # these can be used by format_output and render
        self._value = [key, u('')]
        self._key = key
        self.id_ = self.build_attrs(attrs).get('id', None)