日誌（模塊 logging）

日誌（模塊 logging）

• 基本應用

• 日誌處理本質：Logger/FileHandler/Formatter

• 推薦處理日誌方式

  import logging
  
  file_handler = logging.FileHandler(filename='x1.log', mode='a', 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=[file_handler,],
      level=logging.ERROR
  )
  
  logging.error('你好')
  

• 推薦處理日誌方式 + 日誌分割

  import time
  import logging
  from logging import handlers
  # file_handler = logging.FileHandler(filename='x1.log', mode='a', encoding='utf-8',)
  file_handler = handlers.TimedRotatingFileHandler(filename='x3.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=[file_handler,],
      level=logging.ERROR
  )
  
  for i in range(1,100000):
      time.sleep(1)
      logging.error(str(i))
  

  注意事項：

  # 在應用日誌時，如果想要保留異常的堆棧信息。
  import logging
  import requests
  
  logging.basicConfig(
      filename='wf.log',
      format='%(asctime)s - %(name)s - %(levelname)s -%(module)s:  %(message)s',
      datefmt='%Y-%m-%d %H:%M:%S %p',
      level=logging.ERROR
  )
  
  try:
      requests.get('http://www.xxx.com')
  except Exception as e:
      msg = str(e) # 調用e.__str__方法
      logging.error(msg,exc_info=True)