logging模块

打印日志的目的

1 操作审计

2 维护排错

3 数据分析

logging模块的日志等级：

1 debug

2 info

3 warning

4 error

5 critical

日志切割与输出

1 直接输出在屏幕

import logging
import time
sh = logging.StreamHandler()
logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S %p',
    handlers=[sh,],
    level=logging.ERROR
)
for i in range(1, 100000):
    time.sleep(1)
    logging.error('KeyboardInterrupt error %s' % str(i))

2 根据时间切割

import time
import logging
from logging import handlers
fh = handlers.TimedRotatingFileHandler(filename='x2.log', when='s', interval=5, encoding='utf-8')
logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S %p',
    handlers=[fh,],
    level=logging.ERROR
)
for i in range(1, 100000):
    time.sleep(1)
    logging.error('KeyboardInterrupt error %s' % str(i))

3 根据大小切割

import time
import logging
from logging import handlers

sh = logging.StreamHandler()
rh = handlers.RotatingFileHandler('myapp.log', maxBytes=1024, backupCount=5)
logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S %p',
    handlers=[ rh,],
    level=logging.ERROR
)
for i in range(1, 100000):
    time.sleep(1)
    logging.error('KeyboardInterrupt error %s' % str(i))