python列印日誌
https://blog.csdn.net/lxc521wjh/article/details/53212729
通過logging.basicConfig函式對日誌的輸出格式及方式做相關配置。logging.basicConfig(**kwargs) 該函式必須在main函式執行緒除外的子執行緒啟動之前呼叫，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") |
執行：
'D:\Python\logs.txt',
將日誌同時輸出到檔案和螢幕
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) #設定控制檯日誌輸出的級別。如果設定為logging.INFO，就不會輸出DEBUG日誌資訊
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") |
執行：
D:\Python\logs.txt:
RotatingFileHander模組，用於自動切換日誌寫入檔案，保證單個日誌檔案不會太大
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") |
執行:
通過logging.config模組配置日誌
注意：配置檔案必須包含[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檔案如下： [loggers] keys=root,eg01,eg02
#注：[logger_root]為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，但訊息不傳遞；propagate=1是輸出日誌，同時訊息往更高級別的地方傳遞。若這裡的引數progagate=1，那麼將會看到重複的訊息記錄
[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的型別 level=WARNING formatter=form01 args=(sys.stdout,) #根據class的不同而不同，即handler型別的初始化引數。詳情可參考官方logging.conf模組。
[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=
|
說明：當[logger_logname]和[handler_handlername]中同時指定了level值時，使用[handler_handlername]中設定的level。