Logging question

Diez B. Roggisch deets at nospam.web.de
Wed Sep 23 09:02:46 CEST 2009


Gabor Urban schrieb:
> Hi guys,
> 
> I have embarassing problem using the logging module. I would like to
> encapsulate the creation and setting up  of the logger in a class, but
> it does not seem working.
> 
> Here are my relevant parts of the code:
> 
> --
> import sys
> import logging
> 
> class LogClass:
>     def __init__(self, fileName, loggerName = 'classLog'):
>         self.Logger = logging.getLogger(loggerName)
>         self.traceName = fileName
>         handler = logging.FileHandler(self.traceName,'a')
>         formatter = logging.Formatter("%(name)s %(asctime)s
> %(filename)s %(lineno)d %(levelname)s %(message)s")
>         handler.setFormatter(formatter)
>         self.Logger.addHandler(handler)
>         self.Handler = handler
> 
>     def closeLog(self):
>         self.Handler.flush()
>         self.Handler.close()
> 
>     def fetchLogger(self):
>         return self.Logger
> 
> if __name__ == "__main__":
>     name = 'testlog.trc'
>     classLog = LogClass(name)
>     logger = classLog.fetchLogger()
>     logger.info("Created")
>     logger.debug("Test")
>     logger.info("Created .. ")
>     logger.debug("Test data")
>     classLog.closeLog()
> 
> --
> 
> The trace file is created properly but contains no lines at all. If I
> put the code directly in __main__, it works fine.
> 
> What did I miss? Any ideas are wellcome.

That the default level is less than INFO - if you set that to e.g. 
logging.DEBUG.

However, I think there are a few problems here beside that. For once, 
reading PEP8 might be worth considering.

And the logging-module is written so that setting it up & using it are 
de-coupled. Which you foil here somewhat. What is the above supposed to do?

Diez



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