用單例模式實現日誌記錄

話不多說，上代碼！

Logger_Singleton.py

class Logger_Singleton(object):
    class __Logger(object):
        __instance = None
        def __init__(self,file_name):
            self.file_name = file_name
        
        def _write_log(self,level,msg):
            with open(self.file_name,"a") as write_log:
                write_log.write("[{0}] : {1}".format(level,msg)

        def critical(self,msg):
            self._write_log("CRITICAL",msg)
        
        def error(self,msg):
            self._write_log("ERROR",msg)
        
        def warn(self,msg):
            self._write_log("WARN",msg)
        
        def info(self,msg):
            self._write_log("INFO",msg)
       
        def debug(self,msg):
            self._write_log("DEBUG",msg)
        
        def __str__(self,file_name):
            return "{0!r} {1}".format(self,file_name)
    
    
    __instance = None
    
    def __new__(cls,file_name):
        if not cls.__instance:
            cls.__instance = cls.__Logger(file_name)
        return cls.instance

    def __init__(self,name):
        self.name = file_name
     
    def __getattr_(self,name):
        return getattr(self.instance,name)

    def __setattr(self,name):
        return setattr(self.instance.name)
        

test_logger.py

from Logger_Singleton import Logger_Singleton


file_name = "./log.txt"
log_01 = Logger_Singleton(file_name)
log_02 = Logger_Singleton(file_name)
print(id(log_01))
print(id(log_02))
log_01.critical("I am a critical")
log_02.debug("I am a debug")