Question

我在一个帖子中传递了一个链接作为参数，我想要抓住时间戳。但是在线程指向的函数中，每次重新编写时，时间戳值都不会改变。你如何让timeLink成为动态的，并在每次循环时改变它？这是代码：

def abcStart(timeLink):

    while True:
        res = timeLink
        res.raise_for_status()
        timestamp = BeautifulSoup(res.content, 'html.parser').find_all('b')

        if timestamp[0].text == otherTimestamp[0].text:
            work on something
            break
        if timestamp[0].text > otherTimestamp[0].text:
            continue
        else:
            print('not yet')
        time.sleep(30)
    break

timelink = requests.get('http://example.com/somelink')

threadobj = threading.Thread(target=abcStart, args=(timelink))
threadobj.start()
threadobj.join()

Answer 1

我想你应该在你的函数中移动timeLink请求：

def abcStart(timeLink):

    while True:
        res = requests.get('http://example.com/somelink')
        res.raise_for_status()
        timestamp = BeautifulSoup(res.content, 'html.parser').find_all('b')

        if timestamp[0].text == otherTimestamp[0].text:
            work on something
            break
        if timestamp[0].text > otherTimestamp[0].text:
            continue
        else:
            print('not yet')
        time.sleep(30)
    break

threadobj = threading.Thread(target=abcStart, args=())
threadobj.start()
threadobj.join()

Answer 2

看起来只有一个http请求被发送。在这一行：

timelink = requests.get('http://example.com/somelink')

abcStart（）函数正在接收http响应，并在整个运行时使用该值。这将导致我们每次都刮同一页。如果我们想要为每个循环迭代抓取一个不同的页面，我们每次都需要执行另一个http请求。像这样：

def abcStart(timeLink):

while True:
    res = requests.get(timeLink) # send request here
    res.raise_for_status()
    timestamp = BeautifulSoup(res.content, 'html.parser').find_all('b')

    if timestamp[0].text == otherTimestamp[0].text:
        work on something
        break
    if timestamp[0].text > otherTimestamp[0].text:
         continue
    else:
        print('not yet')
    time.sleep(30)
break

timeLink = 'http://example.com/somelink' # declare url

threadobj = threading.Thread(target=abcStart, args=(timelink))
threadobj.start()
threadobj.join()

Python - 如何获取作为参数传递的更新链接？

2 个答案: