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python的logging库
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logging库
简介
logging库提供日志打印功能。
值得一提的是，不仅能打印到日志文件，还能打印到控制台。
日志级别
logging一共分为5个级别，从低到高依次为： DEBUG<INFO<WARNING<ERROR<CRITICAL
日志参数配置
配置接口logging.basicConf()
参数详解
控制日志的级别
level=logging.DEBUG (或者： logging.INFO / logging.WARNING / logging.ERROR / logging.CRITICAL）
假如level=logging.WARNING, 那么低于warning级别的日志都不会打印了。
设置日志名字（也设置了日志存放的路径）
filename="%s/test.log" % "/home/work"
设置文件模式
什么是文件模式呢？
filemode='w' （或者'a'）
'w'表示什么意思？
'a'表示什么意思？
设置日志格式
控制了每一行日志都输出哪些字段
format="%(levelname)s-%(asctime)s-%(filename)s-%(funcName)s-%(lineno)d-％(message)s"
其中每个字段什么意思呢，可以参考下面
日志级别
%(levelno)s 日志级别数值
%(levelname)s 日志级别名字
%(asctime)s 日志打印时间
%(filename)s 文件名称
%(funcName)s 函数名称
%(lineno)d 行号
%(process)d 进程ID
%(thread)d 线程ID
％(threadName) 线程名称
％(message)s 打印日志信息
demo(demo-1) 将日志输出在控制台import logging
logging.basicConfig(level=logging.INFO,
filemode='a',
format="[%(levelname)s][%(asctime)s]%(filename)s-%(lineno)d %(message)s")if __name__ == "__main__": logging.debug("this is debug message")
logging.info("this is info message")
logging.warning("this is warning message")
logging.error("this is error message")
logging.critical("this is critical message")
import logging
logging.basicConfig(level=logging.INFO,
filemode='a',
format="[%(levelname)s][%(asctime)s]%(filename)s-%(lineno)d %(message)s")if __name__ == "__main__": logging.debug("this is debug message")
logging.info("this is info message")
logging.warning("this is warning message")
logging.error("this is error message")
logging.critical("this is critical message")
输出结果
[INFO][-- ::,]run.py- this is info message
[WARNING][-- ::,]run.py- this is warning message
[ERROR][-- ::,]run.py- this is error message
[CRITICAL][-- ::,]run.py- this is critical messageProcess finished with exit code
(demo-2) 将日志输出在日志文件logging.basicConfig(level=logging.INFO,
filename="%s/run_info.log" % LOG_PATH,
filemode='a',
format="[%(levelname)s][%(asctime)s]%(filename)s-%(lineno)d %(message)s")if __name__ == "__main__": logging.debug("this is debug message")
logging.info("this is info message")
logging.warning("this is warning message")
logging.error("this is error message")
logging.critical("this is critical message")
logging.basicConfig(level=logging.INFO,
filename="%s/run_info.log" % LOG_PATH,
filemode='a',
format="[%(levelname)s][%(asctime)s]%(filename)s-%(lineno)d %(message)s")if __name__ == "__main__": logging.debug("this is debug message")
logging.info("this is info message")
logging.warning("this is warning message")
logging.error("this is error message")
logging.critical("this is critical message")
输出结果
➜ log cat /Users/liurong07/Documents/code/QA/20181018/log/run_info.log
[INFO][2018-10-19 11:07:34,372]run.py-25 this is info message
[WARNING][2018-10-19 11:07:34,373]run.py-26 this is warning message
[ERROR][2018-10-19 11:07:34,373]run.py-27 this is error message
[CRITICAL][2018-10-19 11:07:34,374]run.py-28 this is critical message
