Python：日志输出（单例模式保证logger实例唯一）

最新推荐文章于 2025-06-17 18:02:26 发布

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最新推荐文章于 2025-06-17 18:02:26 发布 · 3.9k 阅读

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本文详细介绍了如何在Python中利用单例模式确保日志模块的logger实例在整个应用中保持唯一，从而有效地管理和统一输出日志信息。通过这种方式，可以避免在大型项目中因多次初始化logger导致的日志混乱问题。

#!/usr/bin/env python
# coding:UTF-8


"""
@version: python3.x
@author:曹新健
@contact: 617349013@qq.com
@software: PyCharm
@file: 单例模式装饰日志类.py
@time: 2018/10/18 15:10
"""
import os,logging,sys,time

def singleton(cls):
  instances = {}
  def _singleton(*args,**kwargs):
    if cls not in instances:
      instances[cls] = cls(*args,**kwargs)
    return instances[cls]
  return _singleton

@singleton
class Logger():
    def __init__(self,logfile=None):
        self.logger = logging.getLogger()
        formater = logging.Formatter('%(asctime)s %(name)s  %(levelname)s %(filename)s  %(lineno)d '
                        '%(thread)d %(threadName)s %(process)d %(message)s')
        if logfile == None:
            cur_path = os.path.split(os.path.realpath(__file__))[0]
            stime = time.strftime("%Y-%m-%d",time.localtime())
            logfile = cur_path + os.sep + "log_" + stime + ".log"
        else:
            logfile = logfile
        self.