使用 Selenium 从 pubchem 网站获取号码

Question

我正在使用以下代码在 pubchem 网站上进行搜索。我需要从搜索结果的屏幕中获取“复合 CID：”编号，但我无法获取。我需要这方面的帮助。

driver = webdriver.Chrome()
url = "https://pubchem.ncbi.nlm.nih.gov/"
driver.get(url)
driver.maximize_window()
searchInput = driver.find_element_by_xpath("/html/body/div[1]/div/div/main/div[1]/div/div[2]/div/div[2]/form/div/div[1]/input")
searchInput.click()
searchInput.send_keys("75-05-8")
searchInput.send_keys(Keys.ENTER)
time.sleep(2)
driver.close()

Answer 1

要打印文本6342，您可以使用以下任一Locator Strategies：

• 使用 css_selector 和 get_attribute("innerHTML"):

  print(driver.find_element(By.CSS_SELECTOR, "a[data-label^='Featured Compound Result Secondary Link; Position:1; Page:1'] > span.breakword > span").get_attribute("innerHTML"))
  

• 使用xpath和text属性：

  print(driver.find_element(By.XPATH, "//a[starts-with(@data-label, 'Featured Compound Result Secondary Link; Position:1; Page:1')]/span[@class='breakword']/span").text)
  

---

理想情况下，您需要为visibility_of_element_located() 诱导WebDriverWait，您可以使用以下任一Locator Strategies：

• 使用 CSS_SELECTOR 和 text 属性：

  driver.get("https://pubchem.ncbi.nlm.nih.gov/")
  WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "input[type='text'][id^='search']"))).send_keys("75-05-8" + Keys.RETURN)
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "a[data-label^='Featured Compound Result Secondary Link; Position:1; Page:1'] > span.breakword > span"))).text)
  

• 使用 XPATH 和 get_attribute("innerHTML"):

  driver.get("https://pubchem.ncbi.nlm.nih.gov/")
  WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//input[@type='text'][starts-with(@id, 'search')]"))).send_keys("75-05-8" + Keys.RETURN)
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//a[starts-with(@data-label, 'Featured Compound Result Secondary Link; Position:1; Page:1')]/span[@class='breakword']/span"))).text)
  

• 注意：您必须添加以下导入：

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

• 控制台输出：

  6342
  

您可以在How to retrieve the text of a WebElement using Selenium - Python找到相关讨论

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参考文献

链接到有用的文档：

• get_attribute() 方法 Gets the given attribute or property of the element.
• text 属性返回 The text of the element.
• Difference between text and innerHTML using Selenium