[Python-Dev] Redirecting warnings.showwarning to logging

Brett Cannon brett at python.org
Sat Nov 22 20:50:46 CET 2008

On Sat, Nov 22, 2008 at 03:12, Vinay Sajip <vinay_sajip at yahoo.co.uk> wrote:
> Brett Cannon has suggested [1] that the logging package should provide an
> implementation of warnings.showwarning which redirects to logging. Here are my
> first thoughts about how this might work:
> A new function, showwarning( message, category, filename, lineno[, file]) will
> be added to the logging package. To redirect all warnings to the logging system,
> it will only be necessary to do the following:
> warnings.showwarning = logging.showwarning
> The implementation of logging.showwarning will call formatwarning(message,
> category, filename, lineno) and will log the resulting string to a warnings
> logger named "stdlib.warnings" (or perhaps "std.warnings") with level
> logging.WARNING. The optional file argument to logging.showwarning is only for
> signature compatibility with warnings.showwarning and will be ignored; in order
> to configure logging of warnings to any particular destination, the logging
> configuration will need to add appropriate handlers to the warnings logger. The
> precise format of the logging message will be determined by the logging
> configuration in effect, i.e. any formatters configured for the handlers
> attached to the logger.
> Does this sound like a reasonable approach? Can someone please suggest any
> improvements, or let me know if I've missed anything?

Basically what I had in mind, so it sounds reasonable to me.


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