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1. Coroutine scheduling is completely performed in user space. Can only be scheduled from explicitly declared schedulable locations.
In Python, it is used as a generator iterator, returned by the generator iterator function.
2. Any ordinary function with a yield expression will be processed by the interpreter into a generator iterator function, and the generator iterator will be returned after execution.
Example
def gen(): yield 1 # do sth yield 2 # do sth coro = gen() coro.send(None) # 1 coro.send(None) # 2
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