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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _init_job_from_response(self, response):
 """ Helper function to create a Job instance from a response. """

    job = None
    if response and 'jobReference' in response:
      job = _job.Job(job_id=response['jobReference']['jobId'], context=self._context)
    return job