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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 is_job_done(job_id, conn=None):
 """ is_job_done function checks to if Brain.Jobs Status is 'Done' :param job_id: <str> id for the job :param conn: (optional)<connection> to run on :return: <dict> if job is done <false> if """

    result = False
    get_done = RBJ.get_all(DONE, index=STATUS_FIELD)
    for item in get_done.filter({ID_FIELD: job_id}).run(conn):
        result = item
    return result