[Twisted-Python] Keeping logger from snatching stdout?

[Jeff Grimmett]

Hi, Glyph,

On Wed, Sep 5, 2018 at 3:27 AM Glyph <glyph at twistedmatrix.com> wrote:

>
>
> On Aug 29, 2018, at 3:48 PM, Jeff Grimmett <grimmtooth at gmail.com> wrote:
>
> Why would you do this rather than simply handle logging events? Both
> twisted and the stdlib have mechanisms for adding observers that will give
> you access to more structured information - particularly useful if you are
> trying to display something in a GUI.
>

That's a little more blam than this little script really needs, though I
appreciate the suggestion.


> I brought flask-twisted in local to my code so I could monkey around with
> it. First thing I noticed was that it was using twisted.python.log. I
> messed around with that - commented it out, and now I get no stdout output
> at all.  Set the parameter setStdout to False, same thing.
>
>
> So, this is the old, legacy API, and what you want to use is this:
> https://twistedmatrix.com/documents/current/api/twisted.logger.LogBeginner.beginLoggingTo.html
>

Yeah. Also noted when I saw it. Again, seemed to be more effort than I
wanted, though if someone were to say "well, that's what you're stuck with
if you use that legacy stuff" I'd be off to do the thing.


> I'm very curious what is going on here, and whether it's a logging system
> bug.  Could you whittle this down to a minimal reproducer?
>

The sad part is that when I went to put together  the minimal reproducer,
the problem went away.

There is something in my code somewhere that is causing this. I have no
idea what it is, yet, but when I put together a minimal web server that
uses twisted.reactor.callLater() to periodically start a background task,
Twisted is not grabbing stdout or even pushing its own logging to sdtout.

I think it might be how I set up the original project in my IDE - for the
sample project, I started with a clean directory and clean project file
(PyCharm if it matters). So I'm gonna pursue that further.  I think that it
might be the IDE's environment if you tell it "this is a Flask project". I
was seeing weird things from the minimal example as well until I cleared
out all the IDE meta files and reinitiated it as a "pure Python" (in
PyCharm terms) project.

Thanks for your time and thanks for the push that got me moving (hopefully)
in the right direction. :)

 Regards,

Jeff
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