Python logging 日志例程

【实例简介】

Python logging 日志例程，实现logging等级设置、输出方式设置、输出格式设置

【实例截图】

【核心代码】

import  logging
class ContextFilter(logging.Filter):
     def filter(self, record):
         record.userid = '123'
         return True
 

if __name__ == '__main__':
     # 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 for console handler
     formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
     # add formatter to console handler
     ch.setFormatter(formatter)

    # create file handler and set level to warn
     fh = logging.FileHandler('spam.log')
     fh.setLevel(logging.WARN)
    # create formatter for file handler
     formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(userid)s - %(message)s')
      # add formatter to file handler
     fh.setFormatter(formatter)
     # add context filter to file handler
     fh.addFilter(ContextFilter())
 
     # add ch、fh to logger
     logger.addHandler(ch)
     logger.addHandler(fh)
 
     # 'application' code
     logger.debug('debug message')
     logger.info('info message')
     logger.warn('warn message %s', 'args')
     logger.error('error message')
     logger.critical('critical message')