<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_job_complete(job_id, conn=None):
 """ is_job_done function checks to if Brain.Jobs Status is Completed Completed is defined in statics as Done|Stopped|Error :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
    job = RBJ.get(job_id).run(conn)
    if job and job.get(STATUS_FIELD) in COMPLETED:
        result = job
    return result