return a dict

def status_count(self, project):
        '''
        return a dict
        '''
        pipe = self.redis.pipeline(transaction=False)
        for status in range(1, 5):
            pipe.scard(self._gen_status_key(project, status))
        ret = pipe.execute()

        result = {}
        for status, count in enumerate(ret):
            if count > 0:
                result[status + 1] = count
        return result