[Twisted-Python] Handling errors when using deferToThread

[Pedro Sanchez]

On Sat, 2005-29-10 at 00:56 +1000, Andrew Bennetts wrote:
> On Fri, Oct 28, 2005 at 10:35:08AM -0400, Pedro Sanchez wrote:
> [...]
> > This works well as long as doLongCalculation() doesn't fail for
> > any reason. But if it does, how can it trigger an errBack?
> 
> Just raise an exception.
> 
> > I want to do something like this:
> > 
> > from twisted.internet import threads
> > def doLongCalculation():
> >     try:
> >        # .... do long calculation here ...
> >     except:
> >        < what can I return here to tell that
> >          the calculation failed? >
> >     return 3
> 
> The literal answer here is a bare raise statement.  But better would be to
> not use the try-except at all.
> 
Why? What's the alternative?

> Try inserting something like "1/0" into doLongCalculation and see what
> happens.
> 
I don't understand your "1/0" suggestion. Can you elaborate a bit?

Thanks.

-- 
Pedro

> -Andrew.
> 
> 
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