python 动态增加logger handler

需求：

针对不同的项目按照年月生成不同的日志目录。

import os,datetime,logging,logging.config
from core.config.config_log import *
from core.kernel.exception import *


class Log:
	def __init__(self):
		logging.config.dictConfig(LOG_CONFIG)
		self.logger = logging.getLogger("system")


	def get_logger(self):
		return self.logger


	def create_handler(self,level,file_name):
		handler = logging.handlers.RotatingFileHandler(file_name,"a", maxBytes=0, backupCount=0, delay=False)
		handler.setLevel(level)
		handler.setFormatter(logging.Formatter(LOG_CONFIG["formatters"]["standard"]["format"]))
		return handler


	def create_filter(self):pass


	def create_project_logger(self,project=None):
		if project:
			direct =LOG_PATH + project + "/" + str(TODAY_TIME.year) + "/" + str(TODAY_TIME.month) 
		if not os.path.exists(direct):
			self.logger.info("创建文件夹，directName: %s",direct)
			os.makedirs(direct)
			if not os.path.exists(direct):
				self.logger.error("创建文件夹失败,directName %s",direct)
				raise MyException(-1,"创建日志文件夹失败")
		self.logger.addHandler(self.create_handler(logging.INFO,direct+"/info_" +str(datetime.datetime.now().date())+".log"))
		self.logger.addHandler(self.create_handler(logging.ERROR,direct+"/error_" +str(datetime.datetime.now().date())+".log"))
		# not work
		self.logger.removeHandler(self.create_handler(logging.INFO,LOG_PATH + "/system.log"))
		return self.logger

LOG = Log().get_logger()

配置文件：config_log.py

import datetime


LOG_PATH = './log/'
TODAY_TIME = datetime.datetime.now()
LOG_CONFIG = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'standard': {
            'format': '[%(asctime)s][%(levelname)s]-%(message)s' 
        }
    },
    'filters': {
    },
    'handlers': {
        'system': {
            'level':'INFO',
            'class':'logging.handlers.RotatingFileHandler',
            'filename':  LOG_PATH + "/system.log", 
            'maxBytes': 1024*1024*5, # 5 MB
            'backupCount': 5,
            'formatter':'standard',
             'mode':'a',
        },
        'console':{
            'level': 'INFO',
            'class': 'logging.StreamHandler',
            'formatter': 'standard'
        },
    },
    'loggers': {
        'system':{
            'handlers': ['system','console'],
            'level':"INFO",
            'propagate': False         
        },
    }
}          

说明：当没有项目时，使用日志配置文件的system。有项目时，动态生成对应infohandler,添加到logger中去。