why greenlet, gevent or the stackless are needed?

self.python howmuchistoday at gmail.com
Sat Jul 7 09:09:32 CEST 2012


(I'm very new to this coroutine part
so It's not supposed to attack these modules,
just I don't know the differences)

atfer version 2.5, python officially support coroutine with yield.
and then, why greenlet, gevent, Stackless python are still useful?

it there somthing that "yield" can't do
or just it is easier or powerful?



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