logging的基本使用

logging模块打印log的时候主要有一下几个，级别顺序：CRITICAL>ERROR>WARNING>INFO>DEBUG；

1.日志输出到file：

import logging
logger = logging.getLogger(__name__)
logger.setLevel(level = logging.INFO)
handler = logging.FileHandler("log.txt")
handler.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)

logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")

　　打印的log生成在代码目录下：

2018-09-12 15:43:25,516 - __main__ - INFO - Start print log
2018-09-12 15:43:25,516 - __main__ - WARNING - Something maybe fail.
2018-09-12 15:43:25,516 - __main__ - INFO - Finish

　　如果要同时兼顾到输出到控制台和file：

import logging

logger = logging.getLogger(__name__)
logger.setLevel(level = logging.INFO)

handler = logging.FileHandler("log.txt")
handler.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)

console = logging.StreamHandler()
console.setLevel(logging.INFO)
console.setFormatter(formatter)

logger.addHandler(handler)
logger.addHandler(console)

logger.info("Start print log")
logger.debug("Do something")
logger.warning("Something maybe fail.")
logger.info("Finish")

　同样在log文件和控制台输出：

2018-09-12 16:02:52,266 - __main__ - INFO - Start print log
2018-09-12 16:02:52,290 - __main__ - WARNING - Something maybe fail.
2018-09-12 16:02:52,299 - __main__ - INFO - Finish

　

封装成类

# -*- coding:utf-8 -*-
import logging
log_name = "auto_updated.log"

class Logger:
    def __init__(self, path,clevel = logging.DEBUG,Flevel = logging.DEBUG):
        self.logger = logging.getLogger(path)
        self.logger.setLevel(logging.DEBUG)
        fmt = logging.Formatter('[%(asctime)s] [%(levelname)s] %(message)s', '%Y-%m-%d %H:%M:%S')
        #set CMD log
        sh = logging.StreamHandler()
        sh.setFormatter(fmt)
        sh.setLevel(clevel)
        #set log file
        fh = logging.FileHandler(path)
        fh.setFormatter(fmt)
        fh.setLevel(Flevel)
        self.logger.addHandler(sh)
        self.logger.addHandler(fh)

    def debug(self,message):
        self.logger.debug(message)

    def info(self,message):
        self.logger.info(message)

    def war(self,message):
        self.logger.warn(message)

    def error(self,message):
        self.logger.error(message)

    def cri(self,message):
        self.logger.critical(message)

logger = Logger(log_name, logging.DEBUG, logging.DEBUG)
logger.cri("this is critical log")