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 os import logging ‘‘‘ # 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‘) ‘‘‘ 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 logger logger =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
原文：https://www.cnblogs.com/ASAP/p/11066779.html