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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 status(self, value):
 """Set the workflow stage status."""

        # FIXME(BM) This is currently a hack because workflow stages
        #           don't each have their own db entry.
        pb_key = SchedulingObject.get_key(PB_KEY, self._pb_id)
        stages = DB.get_hash_value(pb_key, 'workflow_stages')
        stages = ast.literal_eval(stages)
        stages[self._index]['status'] = value
        DB.set_hash_value(pb_key, 'workflow_stages', stages)