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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 jobs_get(self, job_id, project_id=None):
 """Issues a request to retrieve information about a job. Args: job_id: the id of the job project_id: the project id to use to fetch the results; use None for the default project. Returns: A parsed result object. Raises: Exception if there is an error performing the operation. """

    if project_id is None:
      project_id = self._project_id
    url = Api._ENDPOINT + (Api._JOBS_PATH % (project_id, job_id))
    return datalab.utils.Http.request(url, credentials=self._credentials)