Python 之logging，,参考视频:https

Python 之logging，,参考视频:https

参考视频:https://www.youtube.com/watch?v=dvtjV4Xmtj0

1.简单用法，不能同时输出到屏幕加文件。 可以用logging.basicConfig()配置。

# Demo https://rgb-24bit.github.io/blog/2018/python-logging.html
logging.basicConfig(level=logging.DEBUG, format=‘%(asctime)s - %(name)s - %(levelname)s - %(message)s‘)
logging.warning(‘This will get logged‘)

2.1 若要同时输出到屏幕加文件。需要用handler 处理

import os
import logging

logger = logging.getLogger() # create instance 对象实例

fh = logging.FileHandler(‘logging_test.log‘)
ch = logging.StreamHandler()

fm=logging.Formatter("%(asctime)s %(message)s")

fh.setFormatter(fm)
ch.setFormatter(fm)

logger.addHandler(fh)
logger.addHandler(ch)

logger.setLevel("DEBUG") # 默认为warning, 打印3行

logger =logger()
logger.debug(‘debug‘)
logger.info("info")
logger.warning("warning")
logger.error("error")
logger.critical("critical")

2.2. 基本用法如2.1.

一般可以封装为一个函数，返回logger ，直接调用。

import osimport logging‘‘‘# Demo https://rgb-24bit.github.io/blog/2018/python-logging.htmllogging.basicConfig(level=logging.DEBUG, format=‘%(asctime)s - %(name)s - %(levelname)s - %(message)s‘)logging.warning(‘This will get logged‘)‘‘‘def logger():        logger = logging.getLogger() # create  instance    fh = logging.FileHandler(‘logging_test.log‘)    ch = logging.StreamHandler()    fm=logging.Formatter("%(asctime)s %(message)s")    fh.setFormatter(fm)    ch.setFormatter(fm)    logger.addHandler(fh)    logger.addHandler(ch)    logger.setLevel("DEBUG")    return loggerlogger =logger()logger.debug(‘debug‘)logger.info("info")logger.warning("warning")logger.error("error")logger.critical("critical")

3. Log 是树形关系，子log. 避免才坑，参考视频：

参考视频:https://www.youtube.com/watch?v=dvtjV4Xmtj0

Python 之logging