[Twisted-Python] Deferreds and progress

[Tobias Oberstein]

With Twisted, a Deferred can have it's callback only triggered once.

With Deferreds in popular JavaScript libraries (when.js, jQuery Deferred, upcoming JS PromiseA proposal),
there is a "progress()" callback for receiving results incrementally (or merely reporting on progress
until the final result arrives). Progress can be triggered more than once.

Is there anything comparable in Twisted?

Cheers,
Tobias

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