Extending logging module

Richard Levasseur richardlev at gmail.com
Sat Aug 11 03:26:14 CEST 2007


On Aug 9, 9:08 am, jay <titleistf... at gmail.com> wrote:
> Hello,
>
> I've been using the python logging module a lot lately, and I've come
> across an instance where I need some new levels.  Specifically, python
> does not include ALERT and NOTICE in the default set of logging
> levels.  I am wondering how trivial it would be to extend the logging
> module to include these 2 levels that are standard with syslog?
>
> My first test was just to use the addLevelName method to add the two
> new levels, but syslog ignores them and logs at the next highest
> priority, no matter what I use.
>
> Looking further into the code and as a test, I changed the following
> to see if this would even work
>
> lib/python2.5/logging/__init__.py
>   -> class Logger
>   -> add new notice and alert root level functions
>   -> new _levelNames for notice and alert
>   -> new default level names for notice and alert
>
> lib/python2.5/logging/handlers.py
>   -> class SysLogHandler priority_map was changed to include notice
> and alert
>
> It actually worked, but this is not the way I would like to handle the
> problem.  I would prefer to extend the classes instead.  However, I'm
> not too familiar with that, and I had to change things in so many
> places, I'm wondering if its even possible?  I don't like changing the
> standard libraries, what happens if I have to upgrade python?  My
> changes get overwritten.
>
> Can anyone offer some help or suggestions?  Thanks
>
> Jay

Try looking at module new, i did the same to add a 'profile' level.
If push comes to shove, you can always wrap your logger object up or
access the __dict__ directly.

http://docs.python.org/lib/module-new.html

hope this helps,
richard




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