def filter_ordering(self, value):
        if value not in self.get_allowed_orderings():
            self.warnings.append('Invalid sort order: {}'.format(value))

        return F()
Enter into IPython notebook shell with an initialized app.
dataset/ETHPy150Open mozilla/kitsune/kitsune/community/api.py/TopContributorsBase.filter_ordering--crossover with--dataset/ETHPy150Open frol/flask-restplus-server-example/tasks/app/env.py/enter