OK, that's it,
so to do what I want I am using:
self.logger = logging.getLogger('debuglog')
hdlr = logging.handlers.RotatingFileHandler(debugfilename,
'a', 0, 5)
hdlr.doRollover()
formatter = logging.Formatter('%(asctime)s %
(levelname)s: %(message)s')
hdlr.setFormatter(formatter)
self.logger.addHandler(hdlr)
Thanks for your help