log 处理

保存文件， 并打印到屏幕

import logging

def  set_log(log_file='log.log'): 
    logging.basicConfig(
        level   = logging.INFO, 
        handlers= [logging.StreamHandler(), logging.FileHandler(log_file)],
        format  = '[%(asctime)s] %(levelname)s (%(filename)s:%(lineno)d) %(message)s', 
        datefmt = '%y-%m-%d %H:%M:%S' )

文件和屏幕显示不同级别内容

    file_handler = logging.FileHandler(p.logfile)
    file_handler.setLevel(logging.WARN)
    logging.basicConfig(level=logging.INFO,
                        format='[%(asctime)s] %(levelname)s (%(filename)s:%(lineno)d) %(message)s',
                        datefmt='%y-%m-%d %H:%M:%S',
                        handlers=[logging.StreamHandler(), file_handler],
                        )