Raise exception as callback

Question

In some exception handling code, I'd like to perform an emergency shutdown operation and then re-raise the exception. I am using an asynchronous programming model (Twisted), and I would like to re-raise the exception in the emergency shutdown's callback.

I'd like to do something like this:

except Exception as e:
    d = emergencyStop()
    d.addCallback(partial(raiseExn, e))

I could define my own raiseExn function:

def raiseExn(e):
    raise e

But it seems silly to add three or four lines to every place I want to use this code. I expect that the raise keyword probably calls a function somewhere in the Python standard library and it would be better to use that. But what is that function?

Possible duplicate of [Python Global Exception Handling](http://stackoverflow.com/questions/6598053/python-global-exception-handling) — jonrsharpe, Aug 14 '16 at 17:29

score 0 · Answer 1 · answered Oct 23 '17 at 17:11

0

You can use the generator.throw for this purpose. The example looks like

except Exception as e:
    d = emergencyStop()
    d.addCallback(lambda: (_ for _ in ()).throw(e)))

answered Oct 23 '17 at 17:11

Chris.Q

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Raise exception as callback

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