@property
    def credentials(self):
        return storage.get_storage(self.request).get()
visit the given expression structure using the given iterator of
dataset/ETHPy150Open google/oauth2client/oauth2client/contrib/django_util/__init__.py/UserOAuth2.credentials--crossover with--dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/sql/visitors.py/traverse_using