@property
    def captcha(self):
        if hasattr(self, '_captcha'):
            return self._captcha
        captcha = None
        if self._field.form.captcha_protected:
            captcha = get_recaptcha_html(self._field.form.recaptcha_public_key,
                                         self._field.form.recaptcha_use_ssl)
        self._captcha = captcha
        return captcha
`_registerDict`: register a `dict` instance
dataset/ETHPy150Open mitsuhiko/fungiform/fungiform/widgets.py/FormWidget.captcha--crossover with--dataset/ETHPy150Open ufora/ufora/packages/python/pyfora/PyObjectWalker.py/PyObjectWalker._registerDict