Python：selenium.common.exceptions.NoSuchElementException：消息：没有这样的元素：无法找到元素：

Question

我正在尝试使用 selenium python 从 Youtube 抓取数据。我正在抓取的数据具有订阅者、位置、加入和视图等字段。尽管给出了正确的 xpath，但我得到了这样的错误

selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"xpath","selector":"//*[@id="subscriber-count"]"}
  (Session info: chrome=90.0.4430.93)

我尝试过的方法是使用 css_selectors、完整的 xpath、id、类名，但它们都没有真正起作用。都返回与上述相同的错误。

这是我在 python 脚本中的编写方式：

        youtube_subscribers = browser.find_element_by_xpath('//*[@id="subscriber-count"]').text
        youtube_location = browser.find_element_by_xpath('//*[@id="details-container"]/table/tbody/tr[2]/td[2]/yt-formatted-string').text
        youtube_joined_on = browser.find_element_by_xpath('//*[@id="right-column"]/yt-formatted-string[2]/span[2]').text
        youtube_views = browser.find_element_by_xpath('//*[@id="right-column"]/yt-formatted-string[3]').text

        print('Youtube Subscribers:', youtube_subscribers)
        print('Youtube Location:', youtube_location)
        print('Youtube Joined on:', youtube_joined_on)
        print('Youtube views:', youtube_views)

我正在从这里抓取https://www.youtube.com/c/adidas/about。我到底哪里错了？ 请帮忙！

编辑：这是相同的完整代码。

website = ['https://www.pinterest.com/adidas/', 'https://www.pinterest.com/nike/', 'https://www.pinterest.com/puma/']
    options = webdriver.ChromeOptions()
    options.add_argument('start-maximized')
    options.add_experimental_option("excludeSwitches", ["enable-automation"])
    options.add_experimental_option("useAutomationExtension", False)

    browser = webdriver.Chrome(ChromeDriverManager().install(), options=options)
    delays = [7, 4, 6, 2, 10, 19]
    delay = np.random.choice(delays)
    for crawler in website:
        browser.get(crawler)
        time.sleep(2)
        time.sleep(delay)
        pinterest_brand_name = browser.find_element_by_xpath('/html/body/div[1]/div[1]/div/div/div[1]/div[1]/div[2]/div/div/div/div[2]/div/div/h1').text
        pinterest_followers = browser.find_element_by_xpath('/html/body/div[1]/div[1]/div/div/div[1]/div[1]/div[2]/div/div/div/div[2]/div/div/div[2]/div/span[1]').text
        pinterest_following = browser.find_element_by_xpath('/html/body/div[1]/div[1]/div/div/div[1]/div[1]/div[2]/div/div/div/div[2]/div/div/div[2]/div/div[1]/span[1]').text
        youtube_subscribers = browser.find_element_by_xpath('//*[@id="subscriber-count"]').text
        youtube_location = browser.find_element_by_xpath('//*[@id="details-container"]/table/tbody/tr[2]/td[2]/yt-formatted-string').text
        youtube_joined_on = browser.find_element_by_xpath('//*[@id="right-column"]/yt-formatted-string[2]/span[2]').text
        youtube_views = browser.find_element_by_xpath('//*[@id="right-column"]/yt-formatted-string[3]').text

        print('Pinterest Brand Name:', pinterest_brand_name)
        print('Pinterest Followers:', pinterest_followers)
        print('Pinterest Following:', pinterest_following)
        print('Youtube Subscribers:', youtube_subscribers)
        print('Youtube Location:', youtube_location)
        print('Youtube Joined on:', youtube_joined_on)
        print('Youtube views:', youtube_views)

Answer 1

我看不到您的其余代码，但假设所有这些元素都在同一页面上，并且在第一个页面上失败了，您可能只需要在其中添加一个等待命令以使第一个元素可见.

from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By

youtube_subscribers = WebDriverWait(browser, 10).until(EC.presence_of_element_located((By.XPATH,'//*[@id="subscriber-count"]')))

假设你想要的所有元素都在那个页面上，你应该只需要等待上面那个。不过你可以试试看有什么用

更新代码

下面应该可以工作，将循环分成两部分，这样它就不会在 Pinterest 网站上尝试查找 YouTube 网络元素时失败，反之亦然...

website = ['https://www.pinterest.com/adidas/', 'https://www.pinterest.com/nike/', 'https://www.pinterest.com/puma/',
'https://www.youtube.com/c/adidas/about']

for crawler in website:
    if "pinterest" in crawler:
        browser.get(crawler)
        sleep(3)
        #time.sleep(delay)
        pinterest_brand_name = browser.find_element_by_xpath('/html/body/div[1]/div[1]/div/div/div[1]/div[1]/div[2]/div/div/div/div[2]/div/div/h1').text
        pinterest_followers = browser.find_element_by_xpath('/html/body/div[1]/div[1]/div/div/div[1]/div[1]/div[2]/div/div/div/div[2]/div/div/div[2]/div/span[1]').text
        pinterest_following = browser.find_element_by_xpath('/html/body/div[1]/div[1]/div/div/div[1]/div[1]/div[2]/div/div/div/div[2]/div/div/div[2]/div/div[1]/span[1]').text
        print('Pinterest Brand Name:', pinterest_brand_name)
        print('Pinterest Followers:', pinterest_followers)
        print('Pinterest Following:', pinterest_following)
    elif "youtube" in crawler:
        browser.get(crawler)
        sleep(3)
        #time.sleep(delay)
        youtube_subscribers = browser.find_element_by_xpath('//*[@id="subscriber-count"]').text
        youtube_location = browser.find_element_by_xpath('//*[@id="details-container"]/table/tbody/tr[2]/td[2]/yt-formatted-string').text
        youtube_joined_on = browser.find_element_by_xpath('//*[@id="right-column"]/yt-formatted-string[2]/span[2]').text
        youtube_views = browser.find_element_by_xpath('//*[@id="right-column"]/yt-formatted-string[3]').text
        print('Youtube Subscribers:', youtube_subscribers)
        print('Youtube Location:', youtube_location)
        print('Youtube Joined on:', youtube_joined_on)
        print('Youtube views:', youtube_views)

结果：

Pinterest Brand Name: adidas
Pinterest Followers: 623,732
Pinterest Following: 9
Pinterest Brand Name: Nike
Pinterest Followers: 765,138
Pinterest Following: 3
Pinterest Brand Name: PUMA
Pinterest Followers: 88,759
Pinterest Following: 280
Youtube Subscribers: 925K subscribers
Youtube Location: United States
Youtube Joined on: Oct 29, 2005
Youtube views: 168,725,975 views