python生成器yield语句not yield [英] python generator yield statement not yield

问题描述

这是我正在运行的代码:

Here is code I am running:

def infinite_Third() -> Generator:
    num = 1
    while True:
        if num % 3 ==0:
            i = (yield num)
            if i is not None:
                num = i
        num += 1 

if __name__=='__main__':
    third_gen = infinite_Third()
    for i in third_gen:
        print(f"it is {i}")          
        if i>1000:
            break    
        third_gen.send(10*i+1) 

我希望看到的结果是:

it is 3
it is 33
it is 333
it is 3333

但是，我真正得到的是:

However, what I really get is:

it is 3
it is 36
it is 366
it is 3666

我认为这可能与在主代码中使用 send 有关，但无法弄清楚原因.有人可以帮忙吗?

I think this might be related to using send in the main code, but couldn't figure out why. Can anyone help?

推荐答案

在我的评论之后，我已经修改了您的主循环

Follow up from my comment, I've modified your main loop

• 首先，我们发送 None 来启动生成器并接收第一个值
• 之后，我们发送一个值并接收下一个值

• First, we send a None to start the generator and receive the first value
• After that, we send one value and receive the next one

if __name__ == '__main__':
    third_gen = infinite_Third()
    i = third_gen.send(None)
    while True:
        print(f"it is {i}")
        i = third_gen.send(10*i+1)
        if i > 1000:
            break

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