"Esteve" == Esteve Fernandez <esteve@sindominio.net> writes: Esteve> I'm going to jump in. How about this:
That's nice. But you've coupled the args to aFuncReturningADeferred and what it's Deferred ends up returning to the args for __init__ of the class. I think you meant this: from twisted.internet import defer, reactor def aFuncReturningADeferred(value): d = defer.Deferred() reactor.callLater(5, d.callback, value[::-1]) return d class Foo(object): def __new__(cls, *args, **kw): def cb(x): obj = object.__new__(cls) obj.__init__(*args, **kw) return obj return aFuncReturningADeferred("Some value").addCallback(cb) def __init__(self, value): self.value = value def printFoo(obj): print obj.value reactor.stop() d = Foo("Some other value") d.addCallback(printFoo) reactor.run() I.e., __new__ can do whatever it likes with preparing args for aFuncReturningADeferred (including using args and kw), and all of the args to __new__ are passed to __init__, as the caller would expect from a normal class. You're passing the return result of the Deferred as the single arg to __init__. Anyway, I like it more than my solution. Terry