> Try this:
>
>
> from twisted.logger import globalLogBeginner, textFileLogObserver
> from twisted.internet.defer import Deferred
> import sys
>
> globalLogBeginner.beginLoggingTo([textFileLogObserver(sys.stdout)])
>
> def raiseErr(what):
> raise Exception(what)
>
> d = Deferred()
> d.addCallback(raiseErr)
> d.callback("asdf")
FWIW, I had some trouble (nothing printed) with Python 3.6 using the
example above. Python 2 was fine, and PYTHONUNBUFFERED (or flush) didn't help.
I'll follow up should I figure out what's going on. I had success on
Python3 with the STDLibLogObserver...which doesn't make any immediate
sense other than something flushing related.
>
>
>
> https://twistedmatrix.com/trac/ticket/9333
>
> The associated PR needs a careful review to ensure its handling of unicode is
> correct. Any takers?
Agree, given the recent tickets/regressions related to Unicode I'm going
to go back through my PR. If it disappears from review...I found
something.
> >
> > # how to show the traceback without manually adding an errback at the end?
> > # adding at the *end* of a deferred is hard as we don't know when the
> > client stops adding callbacks.
I've also found this advice from Jean-Paul very helpful:
https://twistedmatrix.com/pipermail/twisted-python/2018-March/031856.html
You'll get more detailed info:
CRITICAL:twisted:Unhandled error in Deferred:
CRITICAL:twisted:(debug: C: Deferred was created:
C: File "foo.py", line 15, in <module>
C: d = defer.Deferred()
I: First Invoker was:
I: File "foo.py", line 17, in <module>
I: d.callback("asdf")
)
Traceback (most recent call last):
File "/home/jlitzing/dev/twisted/twisted-fork/src/twisted/internet/defer.py",
line 653, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "foo.py", line 13, in raiseErr
raise Exception(what)
Exception: asdf
Cheers,
-Jason
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