文件处理程序的不同日志记录级别和Python中的显示

Question

我logging在Python中使用该模块来编写调试和错误消息.

我想写入所有logging.DEBUG或更高的消息.

但是,我只想打印到屏幕上logging.WARNING或更大的消息.

只使用一个Logger和一个可能FileHandler吗？

Answer 1

正如已经提到的那样,处理程序很容易创建和添加,你可能最好只使用两个处理程序.但是,如果由于某种原因你想要坚持使用,那么Python日志记录的食谱会有一个或多或少描述你想要做什么的部分:记录到控制台和文件,但是在不同的级别(它甚至会告诉你如何做不同的格式).它只用一个StreamHandler而不是一个FileHandler,但是:

import logging

# set up logging to file - see previous section for more details
logging.basicConfig(level=logging.DEBUG,
                    format='%(asctime)s %(name)-12s %(levelname)-8s %(message)s',
                    datefmt='%m-%d %H:%M',
                    filename='/temp/myapp.log',
                    filemode='w')
# define a Handler which writes INFO messages or higher to the sys.stderr
console = logging.StreamHandler()
console.setLevel(logging.INFO)
# set a format which is simpler for console use
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
# tell the handler to use this format
console.setFormatter(formatter)
# add the handler to the root logger
logging.getLogger('').addHandler(console)

# Now, we can log to the root logger, or any other logger. First the root...
logging.info('Jackdaws love my big sphinx of quartz.')

# Now, define a couple of other loggers which might represent areas in your
# application:

logger1 = logging.getLogger('myapp.area1')
logger2 = logging.getLogger('myapp.area2')

logger1.debug('Quick zephyrs blow, vexing daft Jim.')
logger1.info('How quickly daft jumping zebras vex.')
logger2.warning('Jail zesty vixen who grabbed pay from quack.')
logger2.error('The five boxing wizards jump quickly.')

编辑:正如评论中所讨论的,这段代码仍会生成两个处理程序,但通过使用basicConfig()"隐藏"一个构造.我强烈建议您明确地创建两者.