[Twisted-Python] twisted eats the error

[steven meiers]

> 
> [SNIP]
> 
> The “Unhanded error in Deferred” isn’t coming from your call to
> deferToThread, it is coming from your task.LoopingCall.  When you
> invoke .start() on your LoopingCall instance, it returns a Deferred,
> which fires its assigned callback handler when you call .stop() on
> the LoopingCall instance, and which fires its assigned errback
> handler if an exception occurs while running the function (in this
> case runEverySecond) passed to the LoopingCall.
> 
> In other words, you need this:
> 
> l = task.LoopingCall(runEverySecond, ‘lala’)
> l.addErrback(printError)
> 

you probably meant:
l = task.LoopingCall(runEverySecond, 'lala')
d = l.start(1.0)
d.addErrback(printError)


your version gives me a attribute error, thanks for clarifying that.