Re: [Python-Dev] Loggers in the stdlib and logging configuration APIs

On Tue, Dec 28, 2010 at 6:53 PM, Nick Coghlan wrote:

On Tue, Dec 28, 2010 at 6:28 PM, Glenn Linderman wrote:

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On 12/28/2010 12:19 AM, Vinay Sajip wrote:

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calls can support three levels of logger disabling: - leave all existing loggers enabled (existing option)

I think you mean disabled - that's the current behaviour.

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- leave only flagged loggers enabled (new default behaviour) - disable all loggers not mentioned explicitly (new option)

My words in his mouth, but I think he meant that the existing _default_ behavior should be changed, and the existing option (listed first), which is not default behaviour should be kept, and a third option to sort of achieve the current default behavior, but make it harder.

It isn't really about making it harder - it is about changing the default behaviour in a backwards compatible way.

As I see it, library level loggers (including those in the standard library) should be left enabled unless explicitly turned off, while application level loggers should be left disabled unless explicitly turned on.

To put a bit more nuance on that view: if the library uses the logger to report errors, it should *definitely* flag it to be implicitly enabled. If it is only used for info messages, then preferences will vary according to the library developer. The beauty of the logging system is that application authors can get at the logging information regardless of which default the library author chooses. Cheers, Nick. -- Nick Coghlan   |   ncoghlan@gmail.com   |   Brisbane, Australia