On 06/25/2012 10:47 PM, Martin wrote:
> Well, kind of - I know that I need to do addErrBack on the deferred
> objects, I kind of knew that when I asked the original question having
> read the documentation on deferreds. What I still don't know though is
> how am I supposed to catch these deferreds - that is not being explained
> anywhere in the documentation I'm afraid.
What do you mean by "catch these deferreds"?
A deferred is just a return value of a function, either in the Twisted
API or your own code. For example:
from twisted.web import client
def ignore_err(failure):
pass
def work():
a_deferred = client.getPage(...)
a_deferred.addErrback(ignore_err)
If you are seeing unhandled errors in deferreds and you don't know which
deferreds, you're probably throwing away a return value somewhere. The
traceback should point you in the right directon.
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