def get_hidden_fields(self):
        fields = []
        if self._field.form.request_info is not None:
            if self._field.form.csrf_protected:
                fields.append(('_csrf_token', self.csrf_token))
            if self._field.form.redirect_tracking:
                target = self.redirect_target
                if target is not None:
                    fields.append(('_redirect_target', target))
        return fields
This method is called by the `hidden_fields` property to return
dataset/ETHPy150Open mitsuhiko/fungiform/fungiform/widgets.py/FormWidget.get_hidden_fields