在python中logger setlevel没有生效的解决

import logging
 
 
class loggerr(object):
  def __init__(self,logger):
    self.logger = logging.getLogger(logger)
    self.fmt=logging.Formatter('%(asctime)s - %(name)s - %(levelname)s -%(message)s ')
    logging.root.setLevel(logging.NOTSET)
    #logging.basicConfig(level=logging.NOTSET)
 
 
  def getlog(self):
 
    ch=logging.StreamHandler()
    sh=logging.FileHandler('log1.log')
 
    ch.setFormatter(self.fmt)
    sh.setFormatter(self.fmt)
 
    ch.setLevel(logging.INFO)
    sh.setLevel(logging.INFO)
 
    self.logger.addHandler(ch)
    self.logger.addHandler(sh)
    return self.logger
 
if __name__ == '__main__':
  mylog=loggerr('mylog').getlog()
  mylog.info('infolog')
  mylog.debug('debuglog')
  mylog.warning('warninglog')
  mylog.error('errorlog')