Overriding a global

[Peter Otten]

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?

def function(self, logger=logger.getChild("function")):
    logger.debug("stuff")

But the "best way" is to use another name.