Deferreds - Example


>>> from twisted.internet.defer import Deferred
>>> d = Deferred()
>>> def square(x): return x*x
... 
>>> def reciprocal(x): return 1.0 / x
... 
>>> d.addCallback(square).addCallback(reciprocal)
<Deferred at 0x40216f0c>
>>> def printResult(result): print 'result is ' + repr(result)
... 
>>> d.addCallback(printResult)
<Deferred at 0x40216f0c>
>>> d.callback(10)
result is 0.01