一般python使用日誌功能

import logging

def logging_init():
   app_name = "AppName"
   log_file_name = "myapp_test.log"
   logger = logging.getLogger(app_name)
   format_str = "[%(asctime)s][%(levelname)s]> %(message)s"
   formatter = logging.Formatter(format_str)
   file_handler = logging.FileHandler(log_file_name)
   file_handler.setFormatter(formatter)
   logger.addHandler(file_handler)
   logger.setLevel(logging.INFO)
   return logger
 

單例模式（一般採用）

import logging

class Singleton(object):
   _instance = None

   def __new__(cls, *args, **kwargs):
      if not cls._instance:
         cls._instance = super(Singleton, cls).__new__(cls,
                                    *args, **kwargs)
      return cls._instance
   
 
   

app_name = "appName"
log_file = "test.log"

class SingletonLogger(Singleton):

   def __init__(self):
      super(SingletonLogger, self).__init__()
      self.logger = logging.getLogger(app_name)
      format_str = "[%(asctime)s][%(levelname)s]> %(message)s"
      formatter = logging.Formatter(format_str)
      file_handler = logging.FileHandler(log_file)
      file_handler.setFormatter(formatter)
      self.logger.addHandler(file_handler)
      self.logger.setLevel(logging.INFO)

   def debug(self, data):
      self.logger.debug(data)

   def info(self, data):
      self.logger.info(data)

   def warning(self, data):
      self.logger.warning(data)


   def error(self, data):
      self.logger.error(data)


def test_log():
   logger = SingletonLogger()
   #output the log msg
   logger.debug("this is the debug message")
   logger.info("this is the info message")
   logger.warning("this is the warning message")
   logger.error("this is the error message")