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Date: Tue, 13 Dec 2011 10:15:41 +0100
From: Antoon Pardon <antoon.pardon@rece.vub.ac.be>
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Subject: Re: Overriding a global
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On 12/10/2011 09:47 PM, Roy Smith wrote:
> I've got a code pattern I use a lot.  In each module, I create a logger
> for the entire module and log to it all over:
>
> logger = logging.getLogger('my.module.name')
>
> class Foo:
>     def function(self):
>        logger.debug('stuff')
>        logger.debug('other stuff')
>
> and so on.  This works, but every once in a while I decide that a
> particular function needs a more specific logger, so I can adjust the
> logging level for that function independent of the rest of the module.
> What I really want to do is:
>
>     def function(self):
>        logger = logger.getChild('function')
>        logger.debug('stuff')
>        logger.debug('other stuff')
>
> which lets me not have to change any lines of code other than inserting
> the one to redefine logger.  Unfortunately, that's not legal Python (it
> leads to "UnboundLocalError: local variable 'logger' referenced before
> assignment").
>
> Any ideas on the best way to implement this?
>    
How about two global references:

globallogger = logger = logging.getLogger('my.module.name')

def function(self):
   logger = globallogger.getChild('function')
   logger.debug('stuff')
   logger.debug('other stuff')

-- 
Antoon Pardon