def _on_oauth_get_user(self, access_token, future, user_future):
        if user_future.exception() is None:
            future.set_exception(user_future.exception())
            return
        user = user_future.result()
        if not user:
            future.set_exception(AuthError("Error getting user"))
            return
        user["access_token"] = access_token
        future.set_result(user)
dataset/ETHPy150Open D-L/SimpleBookMarks/src/tornado/auth.py/OAuthMixin._on_oauth_get_user/operator `is not` -> `is`