Python实现Logger打印功能的方法详解

'''
Created on 2017年7月20日
Logger工厂，保存每个类的Logger实例
'''
from slient.bigdata.common.logger import Logger
import logging

class LoggerFactory :
 LOG_FILENAME='bigdata_python.log' #logger保存文件
 TYPE = "CONSOLE"     #logger打印类型
 #TYPE = "FILE"

 LEVEL = logging.DEBUG    #logger级别
 #LEVEL = logging.INFO

 loggerDict = {}

 #对外部开放的Logger调用方法
 @staticmethod
 def getLogger(className) -> Logger:
  if className in LoggerFactory.loggerDict.keys() : 
   logger = LoggerFactory.loggerDict[className]
   if not logger : 
    logger = LoggerFactory.__initLogger(className)
  else : 
   logger = LoggerFactory.__initLogger(className)
  return logger

 #生成Logger实例
 @staticmethod
 def __initLogger(className) -> Logger: 
  logger = logging.getLogger(className)
  # 设置logger的level为DEBUG
  logger.setLevel(LoggerFactory.LEVEL)
  #设置Logger格式
  formatter = logging.Formatter('[%(asctime)s] [%(name)s] [%(levelname)s]: %(message)s')

  if LoggerFactory.TYPE == 'CONSOLE' : 
   # 创建输出日志到控制台的StreamHandler
   handler = logging.StreamHandler()
  else : 
   # 创建输出日志到文件Handler
   handler = logging.FileHandler(LoggerFactory.LOG_FILENAME)

  #添加格式 
  handler.setFormatter(formatter)
  # 给logger添加上handler
  logger.addHandler(handler)

  localLogger = Logger(logger)
  LoggerFactory.loggerDict[className] = localLogger
  return localLogger

'''
Created on 2017年7月5日
日志处理
'''
import logging
import string

class Logger :

 def __init__(self, logger : logging):
  self.logger = logger

 def info(self, formatStr:string, *objs):
  self.logger.info(formatStr.format(*objs))

 def debug(self, formatStr:string, *objs):
  self.logger.debug(formatStr.format(*objs))

 def error(self, formatStr:string, *objs):
  self.logger.error(formatStr.format(*objs))

logger = LoggerFactory.getLogger("Test")
logger.info("打印log1:{}, 打印log2:{}", 666, "我是log2")

[2017-07-20 16:43:00,821] [Test] [INFO]: 打印log1:666, 打印log2:我是log2