On Wednesday, 27 February 2019 15:11:31 GMT Jean-Paul Calderone wrote: > On Wed, Feb 27, 2019 at 10:07 AM Scott, Barry <barry.sc...@forcepoint.com> > > wrote: > > The code I have posted is the good version so it works and the assert > > does not fire. My goal is to show what I assume is the correct way to code > > a function that uses internal Deferred(), not give an example that breaks. > > > > This should cause the the assert as the code must wait for the thread to > > return a result. > > > > def doWork(): > > d = Deferred() > > d2 = deferToThread(doWorkHelper) > > d.callback(d2) > > return d > > Ah. I see. Indeed, this code is wrong and triggers the assert. For what > it's worth, there is a simpler solution than the example you gave. It uses > the "chainDeferred" method: > > def doWork(): > d = Deferred() > d2 = deferToThread(doWorkHelper) > d2.chainDeferred(d) > return d
The improved error message could suggest using chainDeferred() maybe. > > Jean-Paul _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
