def run(self):
        with self.output().open('w') as output:
            for _ in range(1000):
                output.write('{} {} {}\n'.format(
                    random.randint(0, 999),
                    random.randint(0, 999),
                    random.randint(0, 999)))
Returns True iff index exists as private attribute,
dataset/ETHPy150Open spotify/luigi/examples/top_artists.py/Streams.run--crossover with--dataset/ETHPy150Open EricssonResearch/calvin-base/calvin/calvinsys/attribute/private.py/PrivateAttribute.exists