Question

我已经使用RotatingFileHandler模块设置了一个python logging logging并创建了一个字符串格式配置。这是我的测试脚本：

class ExceptionHandler :

    def __init__ ( self ) : 
        self.log = self.setupLog ( "testlog" )

    def setupLog (self, name) :
        log = logging.getLogger(name)

        logging.basicConfig(format="%(levelname)s %(asctime)s %(funcName)s %(lineno)d %(message)s")

        #by setting our logger to the DEBUG level (lowest level) we will include all other levels by default
        log.setLevel(logging.DEBUG)

        #setup the rotating file handler to automatically increment the log file name when the max size is reached
        log.addHandler( logging.handlers.RotatingFileHandler('%s.log' % name, mode='a', maxBytes=50000, backupCount=5) )

        return log

if __name__ == "__main__" :
    exceptionHandler = ExceptionHandler()
    exceptionHandler.log.log( 20, "Successfully completed script!" )

我在testlog.log文件中期待的是此输出;相反，这只是打印到stdout而不是我的文件：

INFO 2015-05-06 09:07:55,472 <module> 56 Successfully completed script!

我在我的文件中得到的只是以下内容而没有任何字符串格式：

Successfully completed script!

有没有人知道我的日志设置/配置有什么问题？

Answer 1

您在控制台上看到了正确的结果，因为日志正从名为Logger的新testlog传播到仍在写入控制台的根记录器。此Logger具有正确的格式设置 basicConfig。

但是，您的新Handler并未从basicConfig()继承该配置，因为as the docs say，其所做的一切都是

通过使用默认Formatter创建StreamHandler并将其添加到根记录器来为日志系统执行基本配置。

您需要add the formatting to your handler。像这样：

#setup the rotating file handler to automatically increment the log file name when the max size is reached
file_handler = logging.handlers.RotatingFileHandler('%s.log' % name, mode='a', maxBytes=50000, backupCount=5)
file_handler.setFormatter(logging.Formatter(fmt="%(levelname)s %(asctime)s %(funcName)s %(lineno)d %(message)s"))
log.addHandler(file_handler)

N.B。如果您不想将消息传递给根记录器，请在log.propagate = False功能中添加setupLog

Answer 2

我通过更改格式化程序如何应用于日志记录处理程序来解决我的问题，如下所示：

def setupLog (self, name) :
    log = logging.getLogger(name)
    #by setting our logger to the DEBUG level (lowest level) we will include all other levels by default
    log.setLevel(logging.DEBUG)

    handler = logging.handlers.RotatingFileHandler('%s.log' % name, mode='a', maxBytes=50000, backupCount=5)

    #logging.basicConfig(format="%(levelname)s %(asctime)s %(funcName)s %(lineno)d %(message)s")
    handler.setFormatter( logging.Formatter( "%(levelname)s %(asctime)s %(funcName)s %(lineno)d %(message)s" ) )

    #setup the rotating file handler to automatically increment the log file name when the max size is reached
    log.addHandler( handler )

    return log

Answer 3

在 log = logging.getLogger（name）*

之前尝试使用 logging.basicConfig

def setupLog (self, name) :
    logging.basicConfig(format="%(levelname)s %(asctime)s %(funcName)s %(lineno)d %(message)s")

    log = logging.getLogger(name)

python日志记录处理程序不将格式化字符串附加到日志

3 个答案: