分配产生的收益是什么? myVar =(收益) [英] what does yield as assignment do? myVar = (yield)

问题描述

主要由于，我对yield返回值很熟悉.这个问题

但是在作业右侧时，yield会做什么?

but what does yield do when it is on the right side of an assignment?

@coroutine
def protocol(target=None):
   while True:
       c = (yield)

def coroutine(func):
    def start(*args,**kwargs):
        cr = func(*args,**kwargs)
        cr.next()
        return cr 
    return start

我在此博客，同时研究状态机和协同程序.

I came across this, on the code samples of this blog, while researching state machines and coroutines.

推荐答案

函数中使用的yield语句将该函数转换为生成器"(创建迭代器的函数).通常通过调用next()恢复生成的迭代器.但是，可以通过调用方法send()而不是next()来将值发送到函数以恢复它:

The yield statement used in a function turns that function into a "generator" (a function that creates an iterator). The resulting iterator is normally resumed by calling next(). However it is possible to send values to the function by calling the method send() instead of next() to resume it:

cr.send(1)

在您的示例中，这将每次将1值分配给c.

In your example this would assign the value 1 to c each time.

cr.next()实际上等效于cr.send(None)

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