Everything there is to know about Python async/await (without asyncio)

async_await.py

class Counter:
    def __init__(self, n=3) -> None:
        self.n = n
        self._cnt = 0

    def __await__(self):
        for _ in range(self.n):
            r = yield self._cnt
            print(f"incrementing by {r}")
            self._cnt += r
        return self._cnt

async def await_counter(n):
    cnt = Counter(n)
    for _ in range(3):
        r = await cnt
        print(f"ok {r}")
    return r

def main():
    a = await_counter(5)
    send = None
    for i in range(12):
        print(f"sending... {send}")
        try:
            r = a.send(send)
            send = i+1
            print(f"receiving... {r}")
        except StopIteration as done:
            print(f"done: {done.value}")
            break


if __name__ == "__main__":
    main()

Thank you, can't believe this kind of stuff isn't the top result on google.