The path to the submit description file representing this job.

def job_file(self):
        """The path to the submit description file representing this job.

        """
        job_file_name = '%s.job' % (self.name)
        job_file_path = os.path.join(self.initial_dir, job_file_name)
        self._job_file = job_file_path
        return self._job_file