https://blog.csdn.net/lxc521wjh/article/details/53212729
通過logging.basicConfig函數對日誌的輸出格式及方式做相關配置。logging.basicConfig(**kwargs) 該函數必須在main函數線程除外的子線程啓動之前調用,否則可能會造成日誌重複記錄
import logging
fmt = '%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s: %(message)s' logging.basicConfig(level=logging.DEBUG, format=fmt, filename='D:\Python\logs.txt', filemode='w', datefmt='%a, %d %b %Y %H:%M:%S' ) logging.debug('this is a debug level message') logging.info("this is a info level message") logging.warning("this is a warning level message") logging.error("this is a error level message") logging.critical("this is a critical level message") |
運行:
'D:\Python\logs.txt',
將日誌同時輸出到文件和屏幕
import logging
fmt = '%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s: %(message)s' logging.basicConfig(level=logging.DEBUG, format=fmt, filename='D:\Python\logs.txt', filemode='w+', datefmt='%a, %d %b %Y %H:%M:%S' )
console = logging.StreamHandler() console.setLevel(logging.DEBUG) #設置控制檯日誌輸出的級別。如果設置爲logging.INFO,就不會輸出DEBUG日誌信息
formatter = logging.Formatter(fmt) console.setFormatter(formatter) logging.getLogger().addHandler(console)
logging.debug('this is a debug level message') logging.info("this is a info level message") logging.warning("this is a warning level message") logging.error("this is a error level message") logging.critical("this is a critical level message") |
運行:
D:\Python\logs.txt:
RotatingFileHander模塊,用於自動切換日誌寫入文件,保證單個日誌文件不會太大
import logging from logging.handlers import RotatingFileHandler
fmt = '%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s: %(message)s' logging.basicConfig(level=logging.DEBUG, format=fmt, filename='D:\Python\logs.txt', filemode='w+', datefmt='%a, %d %b %Y %H:%M:%S' )
console = logging.StreamHandler() console.setLevel(logging.DEBUG)
formatter = logging.Formatter(fmt) console.setFormatter(formatter) logging.getLogger().addHandler(console)
rt_file_handler = RotatingFileHandler('d:\Python\logs1.txt',maxBytes = 100,backupCount=5) rt_file_handler.setLevel(logging.INFO) formatter = logging.Formatter('%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s') rt_file_handler.setFormatter(formatter)
logger = logging.getLogger() logger.addHandler(rt_file_handler)
logging.debug('this is a debug level message') logging.info("this is a info level message") logging.warning("this is a warning level message") logging.error("this is a error level message") logging.critical("this is a critical level message") |
運行:
通過logging.config模塊配置日誌
注意:配置文件必須包含[loggers], [handlers],[formatters], 且每個節點下的logger, handler, formatter都必須有對應的節點,且格式正確:[loggers_logger], [handlers_handler], [handlers_formatter]
D:/log.conf文件如下: [loggers] keys=root,eg01,eg02
#注:[logger_root]爲root logger專用 [logger_root] level=NOTSET handlers=handler01, handler02
[logger_eg01] handlers=handler01 qualname=eg01 propagate=0 #propagete=0,表示輸出日誌,但消息不傳遞;propagate=1是輸出日誌,同時消息往更高級別的地方傳遞。若這裏的參數progagate=1,那麼將會看到重複的消息記錄
[logger_eg02] handlers=handler02 qualname=eg02 #qualname指定logger的名稱 propagate=0
[handlers] keys=handler01,handler02
[handler_handler01] class=StreamHandler #指定handler的類型 level=WARNING formatter=form01 args=(sys.stdout,) #根據class的不同而不同,即handler類型的初始化參數。詳情可參考官方logging.conf模塊。
[handler_handler02] class=FileHandler level=ERROR formatter=form02 args=('d:/logs.txt', 'a')
[formatters] keys=form01,form02
[formatter_form01] format=%(name)s: %(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s datefmt=%a, %d %b %Y %H:%M:%S
[formatter_form02] format=%(name)-12s: %(levelname)-8s %(message)s datefmt=
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說明:當[logger_logname]和[handler_handlername]中同時指定了level值時,使用[handler_handlername]中設置的level。