python logging 日志轮转文件不删除问题的解决方法

#!/user/bin/env python
# -*- coding: utf-8 -*-

import logging
from logging.handlers import TimedRotatingFileHandler
log = logging.getLogger()
file_name = "./test.log"
logformatter = logging.Formatter('%(asctime)s [%(levelname)s]|%(message)s')
loghandle = TimedRotatingFileHandler(file_name, 'midnight', 1, 2)
loghandle.setFormatter(logformatter)
loghandle.suffix = '%Y%m%d'
log.addHandler(loghandle)
log.setLevel(logging.DEBUG)

log.debug("init successful")

import logging

# create logger
logger = logging.getLogger('simple_example')
logger.setLevel(logging.DEBUG)

# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

# create formatter
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

# add formatter to ch
ch.setFormatter(formatter)

# add ch to logger
logger.addHandler(ch)

# 'application' code
logger.debug('debug message')

def getFilesToDelete(self):
  """
  Determine the files to delete when rolling over.

  More specific than the earlier method, which just used glob.glob().
  """
  dirName, baseName = os.path.split(self.baseFilename)
  fileNames = os.listdir(dirName)
  result = []
  prefix = baseName + "."
  plen = len(prefix)
  for fileName in fileNames:
   if fileName[:plen] == prefix:
    suffix = fileName[plen:]
    if self.extMatch.match(suffix):
     result.append(os.path.join(dirName, fileName))
  result.sort()
  if len(result) < self.backupCount:
   result = []
  else:
   result = result[:len(result) - self.backupCount]
  return result

elif self.when == 'D' or self.when == 'MIDNIGHT':
   self.interval = 60 * 60 * 24 # one day
   self.suffix = "%Y-%m-%d"
   self.extMatch = r"^\d{4}-\d{2}-\d{2}$"