python3 logging日志切割

背景

平时创建的项目或者脚本，运行时间久了难免会产生一堆日志或者日志文件很大。不记录日志怕出问题无从排查，记录日志又担心浪费空间，因此项目开发的时候就应该重视日志管理。

下面介绍下使用python logging handlers模块管理日志的过程。

 

安装

python 自带模块，不用安装

 

logging模块自带的两种日志切割管理方法

RotatingFileHandler

logging.handlers.RotatingFileHandler(filename, mode='a', maxBytes=0, backupCount=0, encoding=None, delay=0)

import time
import logging
import logging.handlers

# logging初始化工作
logging.basicConfig()
logger = logging.getLogger('script')
logger.setLevel(logging.INFO)
# 添加TimedRotatingFileHandler
timefilehandler = logging.handlers.TimedRotatingFileHandler(
    "test.log",    #日志路径
    when='S',      # S秒 M分 H时 D天 W周 按时间切割 测试选用S
    interval=1,    # 多少天切割一次
    backupCount=7  # 保留多少天
)
# 设置后缀名称，跟strftime的格式一样
timefilehandler.suffix = "%Y-%m-%d_%H-%M-%S.log"
formatter = logging.Formatter('%(asctime)s|%(name)s | %(levelname)s | %(message)s')
timefilehandler.setFormatter(formatter)
logger.addHandler(timefilehandler)


for i in range(10):
    logger.info("log test")
    time.sleep(1)

TimedRotatingFileHandle

logging.handlers.TimedRotatingFileHandler(filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False)

import time
import logging
import logging.handlers

# logging初始化工作
logging.basicConfig()
logger = logging.getLogger('script')
logger.setLevel(logging.INFO)
# 添加TimedRotatingFileHandler
timefilehandler = logging.handlers.TimedRotatingFileHandler(
    "test.log",        #日志路径
     maxBytes=50000,   #文件到达的大小
     backupCount=7     #保留多少份
)
# 设置切割后文件名称，跟strftime的格式一样
timefilehandler.suffix = "%Y-%m-%d_%H-%M-%S.log"
formatter = logging.Formatter('%(asctime)s|%(name)s | %(levelname)s | %(message)s')
timefilehandler.setFormatter(formatter)
logger.addHandler(timefilehandler)


for i in range(10):
    logger.info("log test")
    time.sleep(1)

参数配置

You can use the when to specify the type of interval. The list of possible values is below. Note that they are not case sensitive.

Value	Type of interval	If/how atTime is used
'S'	Seconds	Ignored
'M'	Minutes	Ignored
'H'	Hours	Ignored
'D'	Days	Ignored
'W0'-'W6'	Weekday (0=Monday)	Used to compute initial rollover time
'midnight'	Roll over at midnight, if atTime not specified, else at time atTime	Used to compute initial rollover time

https://docs.python.org/3.6/library/logging.handlers.html