# coding=utf8 # import  logging # # logging.basicConfig(level=logging.DEBUG, #                 format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s', #                 datefmt='%a, %d %b %Y %H:%M:%S', #                 filename='myapp.log', #                 filemode='w') # # logging.debug('This is debug message') # # logging.info('This is info message') # a=[1,2,3,4] # for aa in a: #  try : #     aa=a[5] #     print aa #  except Exception, e: #     print e #     logging.warning('This is warning message %s'%(e)) import time # import logging import logging.handlers # logging初始化工作 logging.basicConfig() # myapp的初始化工作 myapp = logging.getLogger('myapp') myapp.setLevel(logging.INFO) # 写入文件，如果文件超过100个Bytes，仅保留5个文件。 handler = logging.handlers.RotatingFileHandler(    'myapp.log', maxBytes=10*1024, backupCount=5) formatter = logging.Formatter('%(asctime)s|%(name)-12s: %(levelname)-8s %(message)s') handler.setFormatter(formatter) # 设置后缀名称，跟strftime的格式一样 myapp.addHandler(handler) while True:    time.sleep(0.1)    myapp.info("file test")