Re: [Twisted-Python] Keeping logger from snatching stdout?

Hi, Glyph, On Wed, Sep 5, 2018 at 3:27 AM Glyph wrote:

On Aug 29, 2018, at 3:48 PM, Jeff Grimmett 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.b...

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