def get_data(self, request, key='params'):
        """
        Return stored data from the session store.

        :param key: `str` The key under which the data was stored.
        """
        return request.session.get((constants.SESSION_KEY, key) % '%s:%s')
dataset/ETHPy150Open caffeinehit/django-oauth2-provider/provider/views.py/Mixin.get_data/swapped operands of `%`