如何在 python 中启动一个线程池并在一个线程池完成时停止？

Question

I am trying to write a function that sends multiple requests at once, and returns the first response. I am currently using a concurrent.futures.ThreadPoolExecutor object. I understand that stopping a request in the middle is complicated, so instead I thought I could keep the other threads in the background and return a value early. However, the function seems to wait for the other threads to finish before returning. How can I prevent that? My code looks like this:

def req(urls):
    with concurrent.futures.ThreadPoolExecutor() as executor:
        futures = []
        for url in urls:
            futures.append(executor.submit(get_request, url))
        for future in concurrent.futures.as_completed(futures):
            if future.result():
                return future.result()  # Other threads should stop now
    return False  # No valid response was sent

Answer 1

Try shutdown https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Executor.shutdown

def req(urls):
    with concurrent.futures.ThreadPoolExecutor() as executor:
        futures = []
        for url in urls:
            futures.append(executor.submit(get_request, url))
        for future in concurrent.futures.as_completed(futures):
            if future.result():
                executor.shutdown(wait=False, cancel_futures=True)
                return future.result()  # Other threads should stop now
    return False  # No valid response was sent