logging模块_

logging模块：

import logging

logging.debug('debug message')
logging.info('info message')
logging.warning('warning message')
logging.error('error message')
logging.critical('critical message')

WARNING:root:warning message
ERROR:root:error message
CRITICAL:root:critical message

默认级别为warning，默认显示到运行结果中，默认追加模式

 1 import logging
 2 
 3 logging.basicConfig(
 4     level=logging.DEBUG,
 5     filename="logger.log",
 6     filemode="w",
 7     format="%(asctime)s %(filename)s [%(lineno)d]  %(message)s"
 8 )
 9 
10 #lineno：调用日志输出函数的语句所在的代码行
11 logging.debug('debug message')
12 logging.info('info message')
13 logging.warning('warning message')
14 logging.error('error message')
15 logging.critical('critical message')

查看输出：

#logging.log

2019-03-18 15:11:28,349 logging_test.py [11]  debug message
2019-03-18 15:11:28,349 logging_test.py [12]  info message
2019-03-18 15:11:28,349 logging_test.py [13]  warning message
2019-03-18 15:11:28,350 logging_test.py [14]  error message
2019-03-18 15:11:28,350 logging_test.py [15]  critical message

另一种更简单的方法：

def logger():
    logger=logging.getLogger()

    fh=logging.FileHandler("test_log")
    ch=logging.StreamHandler()

    fm=logging.Formatter("%(asctime)s %(message)s")

    fh.setFormatter(fm)
    ch.setFormatter(fm)

    logger.addHandler(fh)
    logger.addHandler(ch)

    return logger
#-------------------------------

logger=logger()

logger.debug('debug message')
logger.info('info message')
logger.warning('warning message')
logger.error('error message')
logger.critical('critical message')

运行结果不仅在屏幕上显示，也在文件test_log中显示

2019-03-18 15:45:02,454 warning message
2019-03-18 15:45:02,454 error message
2019-03-18 15:45:02,454 critical message

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