def preprocess_jobs_stdin(stdin=sys.stdin, stdout=sys.stdout) -> None:
# load the json from stdin
job_dicts = json.load(stdin)
# parse the job dictionaries into hpc Job objects
jobs = [Job.from_dict(n) for n in job_dicts]
# run our preprocessing
modified_jobs = preprocess_jobs(jobs)
# finally dump the modified jobs out to stdout
json.dump(modified_jobs, stdout, default=lambda x: x.to_dict())
def test_job_json(a: Job):
b = Job.from_dict(a.to_dict())
assert _cmp(a, b)