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Example of Luigi task pipeline
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| # run with a custom --n | |
| # python run_luigi.py SquaredNumbers --local-scheduler --n 20 | |
| import luigi | |
| class PrintNumbers(luigi.Task): | |
| n = luigi.IntParameter(default=10) | |
| def requires(self): | |
| return [] | |
| def output(self): | |
| return luigi.LocalTarget("numbers_up_to_{}.txt".format(self.n)) | |
| def run(self): | |
| with self.output().open('w') as f: | |
| for i in range(1, self.n+1): | |
| f.write("{}\n".format(i)) | |
| class SquaredNumbers(luigi.Task): | |
| n = luigi.IntParameter(default=10) | |
| def requires(self): | |
| return [PrintNumbers(n=self.n)] | |
| def output(self): | |
| return luigi.LocalTarget("squares_up_to_{}.txt".format(self.n)) | |
| def run(self): | |
| with self.input()[0].open() as fin, self.output().open('w') as fout: | |
| for line in fin: | |
| n = int(line.strip()) | |
| out = n * n | |
| fout.write("{}:{}\n".format(n, out)) | |
| if __name__ == '__main__': | |
| luigi.run() |
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