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from twisted.internet.defer import Deferred
def got_poem(res):
print 'Your poem is served:'
print res
def poem_failed(err):
print err.__class__
print err
print 'No poetry for you.'
d = Deferred()
# add a callback/errback pair to the chain
d.addCallbacks(got_poem, poem_failed)
# fire the chain with an error result
d.errback(Exception('I have failed.'))
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