如何从 Python Selenium 中的类中提取所有 href？

Question

我试图从 URL https://www.dx3canada.com/agenda/speakers 中提取人们的 href 。

我试过：

elems = driver.find_elements_by_css_selector('.display-flex card vancouver')
href_output = []
for ele in elems:
    href_output.append(ele.get_attribute("href"))
print(href_output)

但是输出列表什么都不返回......

预期的 href 如下图所示，我希望输出为 href 列表：

我真的很感谢你的帮助！

Answer 1

要从URL https://www.dx3canada.com/agenda/speakers 中提取人们的href属性，因为所需的元素在其中，因此您必须：<iframe>

• Induce WebDriverWait等待所需的框架可用并切换到它。
• Induce WebDriverWait以获取所有位于 的元素的可见性。

• 您可以使用以下定位器策略：

  from selenium import webdriver
  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support import expected_conditions as EC
  
  options = webdriver.ChromeOptions() 
  options.add_argument("start-maximized")
  options.add_experimental_option("excludeSwitches", ["enable-automation"])
  options.add_experimental_option('useAutomationExtension', False)
  driver = webdriver.Chrome(options=options, executable_path=r'C:\WebDrivers\chromedriver.exe')
  driver.get('https://www.dx3canada.com/agenda/speakers')
  WebDriverWait(driver, 30).until(EC.frame_to_be_available_and_switch_to_it((By.CSS_SELECTOR,"iframe#whovaIframeSpeaker")))
  print([my_elem.get_attribute("href") for my_elem in WebDriverWait(driver, 30).until(EC.visibility_of_all_elements_located((By.CSS_SELECTOR, "a.display-flex.card.vancouver")))])
  

• 控制台输出：

  ['https://whova.com/embedded/speaker_detail/dcrma_202003/9942778/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907682/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907688/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907676/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907696/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907690/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907670/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907693/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9942779/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9908087/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907671/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907681/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907673/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907678/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907689/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907674/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907684/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907685/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907686/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9942780/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907695/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907687/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907683/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907692/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907672/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907697/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907680/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907679/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907675/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907677/', 'https://whova.com/embedded/speaker_detail/dcrma_202003/9907694/']
  

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