如何从Python Selenium中的类提取所有href? [英] How to extract all href from a class in Python Selenium?

问题描述

我正在尝试从URL

我非常感谢您的帮助！

解决方案

要从URL https://www.dx3canada.com/agenda/speakers ，因为所需元素位于< iframe> 中，因此您必须:

• 诱导 WebDriverWait 以使所需的框架可用并切换到.
• 促使 WebDriverWait 获取所位于所有元素的可见性.

• 您可以使用以下定位器策略:

  从硒导入Webdriver的

   从selenium.webdriver.support.ui导入WebDriverWait来自selenium.webdriver.common.by导入方式从selenium.webdriver.support导入EC的预期条件选项= webdriver.ChromeOptions()options.add_argument(开始最大化")options.add_experimental_option("excludeSwitches"，[启用自动化"])options.add_experimental_option('useAutomationExtension'，False)driver = webdriver.Chrome(options = options，execute_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")))打印([[WebDriverWait中的my_elem的my_elem.get_attribute("href")(驱动程序，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/"] 

此处您可以在在下面的方法中处理#document的方法找到相关的讨论iframe

I am trying to extract people's href from the URL https://www.dx3canada.com/agenda/speakers.

I tried:

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)

But the output list returns nothing...

The expected href shown as the image below and I hope the outputs as a list of hrefs:

I really appreciate the help!

解决方案

To extract the people's href attribute from the URL https://www.dx3canada.com/agenda/speakers as the the desired elements are within an <iframe> so you have to:

• Induce WebDriverWait for the desired frame to be available and switch to it.
• Induce WebDriverWait for the visibility of all elements located.

• You can use the following Locator Strategies:

  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")))])
  

• Console Output:

  ['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/']
  

Here you can find a relevant discussion on Ways to deal with #document under iframe

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