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March 21, 2020 14:57
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Dynamically specify luigi data flow
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import luigi | |
class ATask(luigi.Task): | |
def output(self): | |
return luigi.LocalTarget("atask_output.txt") | |
def run(self): | |
with self.output().open("w") as outfile: | |
outfile.write("Test") | |
print "ATask was run" | |
class BTask(luigi.Task): | |
parent_task = luigi.Parameter() | |
def requires(self): | |
return self.parent_task | |
def output(self): | |
return luigi.LocalTarget("btask_output.txt") | |
def run(self): | |
with self.output().open("w") as outfile: | |
outfile.write("Test") | |
print "BTask was run" | |
class CTask(luigi.Task): | |
parent_task = luigi.Parameter() | |
def requires(self): | |
return self.parent_task | |
def output(self): | |
return luigi.LocalTarget("ctask_output.txt") | |
def run(self): | |
with self.output().open("w") as outfile: | |
outfile.write("Test") | |
print "CTask was run" | |
if __name__ == '__main__': | |
# --------------------------------- | |
# DEPENDENCY GRAPH DEFINITION | |
# --------------------------------- | |
atask = ATask() | |
btask = BTask(atask) | |
ctask = CTask(btask) | |
# --------------------------------- | |
# SET UP AND RUN THE WORKFLOW | |
# --------------------------------- | |
sch = luigi.scheduler.CentralPlannerScheduler() | |
w = luigi.worker.Worker(scheduler=sch) | |
w.add(ctask) | |
w.run() |
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