Python Selenium：访问aria标签信息

Question

我正在尝试阅读与Google Play商店中存在的应用相关的评论。我正在为此目的使用硒。每个评论都出现在jscontroller =“ H6e0Ge”中。

在jscontroller =“ H6e0Ge”标签内，我试图检索用户给定的等级与“ aria-label”相关联，如图所示。

要阅读所有评论者的评分，我的代码是

driver = webdriver.Chrome('/Users/yasirmuhammad/Downloads/chromedriver')
driver.get('https://play.google.com/store/apps/details?id=com.axis.drawingdesk.v3&hl=en&showAllReviews=true')
for a in driver.find_elements_by_xpath("//*[@class='d15Mdf bAhLNe']"):
    print(a.find_element_by_class_name('X43Kjb').text)
    print(a.find_element_by_class_name('p2TkOb').text)
    print(a.find_element_by_xpath('/html/body/div[1]/div[4]/c-wiz/div/div[2]/div/div[1]/div/div/div[1]/div[2]/div/div[2]/div/div[2]/div[1]/div[1]/div/span[1]/div/div').get_attribute('aria-label'))

第三条打印语句将读取该评分，但问题是所有用户的评分都保持不变。原因是因为我复制了第一个用户评级的完整xpath，因此它对其他用户显示了相同的评级。因此，我用以下语句替换了第三条语句：

print(a.find_element_by_class_name('pf5lIe').get_attribute('aria-label'))

但是，此语句返回“ None”。谁能指导我如何阅读与“ aria-label”相关的信息？

Answer 1

您不能使用H6e0Ge和 html/body/div[1]/div[4]/c-wiz/div/div[2]/div/div[1]/div/div/div[1]/div[2]/div/div[2]/div/div[2]/div[1]/div[1]/div/span[1]/div/div就像定位器一样，因为它们dynamically changes并且不会很快工作。

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

reviews = WebDriverWait(driver, 10).until(EC.visibility_of_all_elements_located((By.XPATH, "//h3[.='User reviews']/following-sibling::div[1]/div")))
for review in reviews:
    print(review.find_element_by_xpath(".//span[1]").text)
    print(review.find_element_by_xpath(".//span[2]").text)
    print(review.find_element_by_xpath(".//div[@role='img']").get_attribute('aria-label'))
    print(review.find_element_by_xpath("descendant::div[@jscontroller][last()])").text)

Xpaths：

//h3[.='User reviews']/following-sibling::div[1]/div//span[1]
//h3[.='User reviews']/following-sibling::div[1]/div//span[2]
//h3[.='User reviews']/following-sibling::div[1]//div[@role='img']
//h3[.='User reviews']/following-sibling::div[1]/div/descendant::div[@jscontroller][last()]

Answer 2

您正在尝试读取标记的父项<div>的属性，但该属性不存在。您需要按以下步骤修复代码：

print(a.find_element_by_xpah('.//div[@jscontroller and @jsmodel and @jsdata]//span[@class='nt2C1d']//div[@aria-label]').get_attribute('aria-label'))

Answer 3

要阅读所有评论者的评分，您需要为visibility_of_all_elements_located()引入 WebDriverWait ，并且可以使用以下Locator Strategies：

• 使用XPATH：

  driver.get('https://play.google.com/store/apps/details?id=com.axis.drawingdesk.v3&hl=en&showAllReviews=true')
  print([my_elem.get_attribute("aria-label") for my_elem in WebDriverWait(driver, 5).until(EC.visibility_of_all_elements_located((By.XPATH, "//h3[text()='User reviews']//following::div[1]//span[text()]//following::div[1]//div[@role='img']")))])
  

• 控制台输出：

  ['Rated 4 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 1 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 4 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 4 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 4 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars', 'Rated 5 stars out of five stars']
  

• 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