Python coroutine scheduling example analysis

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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