yongqing 2021-01-20 14:04:23
Python 自定义 自定 定义 windowsr


python自带的RotatingFileHandler,在windows中运行, 分割文件rename时会出问题。因为windows不支持rename正在使用的文件


自定义handler, 按大小和日期切割文件

原理: handler写文件时调用emit, 其中shouldRollover判断是否要分割, doRollover进行分割. 重写这个两个函数就可以

class BaseRotatingHandler(logging.FileHandler):
def emit(self, record):
Emit a record.
Output the record to the file, catering for rollover as described
in doRollover().
if self.shouldRollover(record):
logging.FileHandler.emit(self, record)
except Exception:


import os
import time
import datetime
import logging
from logging.handlers import RotatingFileHandler
from pathlib import Path
class AutumnRotatingFileHandler(RotatingFileHandler):
def __init__(self, filename, mode='a', maxBytes=0, backupCount=99, encoding=None, delay=False, backupDayCount=30):
filename = str(filename)
self.date_format = "%Y%m%d"
self.create_date = self._now_date()
self.backupCount = backupCount
# 保存原始文件名
self.filename = str(Path(filename).absolute())
self.backupDayCount = backupDayCount
RotatingFileHandler.__init__(self, self.last_file_name(filename), mode=mode, maxBytes=maxBytes, backupCount=backupCount, encoding=encoding, delay=delay)
def _now_date(self):
return time.strftime(self.date_format, time.localtime())
def doRollover(self):
Do a rollover, as described in __init__().
# 关闭当前文件
if = None
# 生成最新文件名
suffix = "."+ self._now_date()
self.baseFilename = str(self.filename) + suffix
if self.backupCount > 0:
for i in range(0, self.backupCount):
number_suffix = "{:0>2d}".format(i)
sfn = ".".join([self.baseFilename, number_suffix])
if os.path.exists(sfn):
number_suffix = "{:0>2d}".format(i)
self.baseFilename = ".".join([self.baseFilename, number_suffix])
# 删除过期文件
# 打开 = self._open()
self.create_date = self._now_date()
def shouldRollover(self, record):
Determine if rollover should occur.
Basically, see if the supplied record would cause the file to exceed
the size limit we have.
# 文件分割条件1: 日期变化
if self._now_date() != self.create_date:
return 1
if is None: # delay was set... = self._open()
# 文件分割条件1: 文件大小超过限制
if self.maxBytes > 0: # are we rolling over?
msg = "%s\n" % self.format(record), 2) #due to non-posix-compliant Windows feature
if + len(msg) >= self.maxBytes:
return 1
return 0
def deleteExpiredFiles(self):
dead_datetime = - datetime.timedelta(days=self.backupDayCount)
filenames = []
for i in range(1, 3):
date = dead_datetime - datetime.timedelta(days=1)
date_str = date.strftime(self.date_format)
base_name = "%s.%s" % (self.filename, date_str)
for j in range(1, self.backupCount):
sfn = "%s.%d" % (base_name, j)
# delete file
for filename in filenames:
if os.path.exists(filename):
def last_file_name(self, filename):
suffix = "."+self._now_date()
base_filename = str(filename) + suffix
if self.backupCount > 0:
for i in reversed(range(0, self.backupCount)):
number_suffix = "{:0>2d}".format(i)
sfn = ".".join([base_filename, number_suffix])
# 最近存在的文件
if os.path.exists(sfn):
number_suffix = "{:0>2d}".format(i)
base_filename = ".".join([base_filename, number_suffix])
return base_filename






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