解决Python logging重复打印问题：多线程与多模块共用Logger的陷阱

 class Log():
 import logging
 def __init__(self):
 self.logger = logging.getLogger(__name__)
 # 以下三行为清空上次文件
 # 这为清空当前文件的logging 因为logging会包含所有的文件的logging
 logging.Logger.manager.loggerDict.pop(__name__)
 # 将当前文件的handlers 清空 
 self.logger.handlers = []
 # 然后再次移除当前文件logging配置
 self.logger.removeHandler(self.logger.handlers)
 # 这里进行判断，如果logger.handlers列表为空，则添加，否则，直接去写日志
 if not self.logger.handlers:
 # loggger 文件配置路径
 self.handler = logging.FileHandler(os.getcwd() + '/logger/%s_log/%s_score.log' % (str(dt.date.today()), str(dt.date.today())))
 # logger 配置等级
 self.logger.setLevel(logging.DEBUG)
 # logger 输出格式
 formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(name)s - %(message)s')
 # 添加输出格式进入handler
 self.handler.setFormatter(formatter)
 # 添加文件设置金如handler
 self.logger.addHandler(self.handler)
 
 # 以下皆为重写方法 并且每次记录后清除logger
 def info(self,message=None):
 self.__init__()
 self.logger.info(message)
 self.logger.removeHandler(self.logger.handlers)
 
 def debug(self,message=None):
 self.__init__()
 self.logger.debug(message)
 self.logger.removeHandler(self.logger.handlers)
 
 def warning(self,message=None):
 self.__init__()
 self.logger.warning(message)
 self.logger.removeHandler(self.logger.handlers)
 
 def error(self,message=None):
 self.__init__()
 self.logger.error(message)
 self.logger.removeHandler(self.logger.handlers)
 
 def critical(self, message=None):
 self.__init__()
 self.logger.critical(message)
 self.logger.removeHandler(self.logger.handlers)

#!/usr/bin/python
# -*- coding:utf-8 -*- 
import logging
import time
import os 
class Log(object):
 '''
封装后的logging
 ''' 
 def __init__(self, logger=None, log_cate='search'):
  '''
   指定保存日志的文件路径，日志级别，以及调用文件
   将日志存入到指定的文件中
  ''' 
  # 创建一个logger
  self.logger = logging.getLogger(logger)
  self.logger.setLevel(logging.DEBUG)
  # 创建一个handler，用于写入日志文件
  self.log_time = time.strftime("%Y_%m_%d")
  file_dir = os.getcwd() + '/../log'
  if not os.path.exists(file_dir):
   os.mkdir(file_dir)
  self.log_path = file_dir
  self.log_name = self.log_path + "/" + log_cate + "." + self.log_time + '.log'
  # print(self.log_name)
 
  fh = logging.FileHandler(self.log_name, 'a') # 追加模式 这个是python2的
  # fh = logging.FileHandler(self.log_name, 'a', encoding='utf-8') # 这个是python3的
  fh.setLevel(logging.INFO)
 
  # 再创建一个handler，用于输出到控制台
  ch = logging.StreamHandler()
  ch.setLevel(logging.INFO)
 
  # 定义handler的输出格式
  formatter = logging.Formatter(
   '[%(asctime)s] %(filename)s->%(funcName)s line:%(lineno)d [%(levelname)s]%(message)s')
  fh.setFormatter(formatter)
  ch.setFormatter(formatter)
 
  # 给logger添加handler
  self.logger.addHandler(fh)
  self.logger.addHandler(ch)
 
  # 添加下面一句，在记录日志之后移除句柄
  # self.logger.removeHandler(ch)
  # self.logger.removeHandler(fh)
  # 关闭打开的文件
  fh.close()
  ch.close()
 
 def getlog(self):
  return self.logger

#!/usr/bin/python
# -*- coding:utf-8 -*-
 
from common.log import Log
log = Log().getlog()
log.info("I am a.py")

#!/usr/bin/python
# -*- coding:utf-8 -*-
 
from common.log import Log
log = Log().getlog()
log.info("I am b.py")

#!/usr/bin/python
# -*- coding:utf-8 -*-
 
import a
import b
from common.log import Log 
log = Log().getlog()
log.info("I am c.py")

from common.log import Log
log = Log(__name__).getlog()
log.info("I am a.py")

from common.log import Log
log = Log(__name__).getlog()
log.info("I am b.py")

import b
import a 
from common.log import Log 
log = Log(__name__).getlog()
log.info("I am c.py")