The recipe as you pointed out works by logging to both (just using multiple handlers). The objective is to log *up to a level* to stdout and the rest to stderr.
See the example console handler here <https://github.com/mariocj89/cpython/commit/501cfcd0f4cad1e04d87b89784988c52a77a80ad> and the filter here <https://gist.github.com/mariocj89/7d873fc84bf8723f5e2740adbeccde12>. Good point about just adding it to the how-to. On 10 February 2018 at 20:20, Chris Angelico <ros...@gmail.com> wrote: > On Sun, Feb 11, 2018 at 6:29 AM, Mario Corchero <marioc...@gmail.com> > wrote: > > Hello All! > > > > I got asked how to configure the logging stack to be able to output > directly > > to console using both stdout and stderr and I could not really find a > great > > answer as adding both as StreamHandlers will result in error and above > > messages going to stdout. > > There's a recipe in the docs that shows how to "fork" to console and file: > > https://docs.python.org/3/howto/logging-cookbook.html#logging-to-multiple- > destinations > > I presume that's what you were looking at? Because yes, that'll do > exactly what you say. > > > The usecase is having a cli or app that wants to log to console as other > > tools. Errors and bove to stderr and normal information to stdout. I know > > the recommended way in Python is to just use print on simple scripts, > but it > > can happen that you import a library you want to see the logs of, and > > therefore you need to set the logging stack. > > > > I have drafted two implementations but I am open to suggestions: > > 1) A "Console Handler" that uses multiple streams and chooses based on > the > > level. > > 2) An inverted filter that can be used to filter everything above info > for > > the stdout Stream handler. > > > > What do you people think? > > If people like it I'll send an issue + PR. > > It would be an interesting variant on the recipe to say "debug and > above, but NOT error and above, goes to this stream". How complex are > the implementations? Would they fit nicely into the cookbook? > > ChrisA > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
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