python - 如何使用 Selenium 提取 src 属性的值

Question

我对一些连名字都不知道的东西有疑问。

我正在尝试使用 selenium 访问 src= "LINK" 旁边的链接。

我有 class name = tWeCI，我想我需要使用它来实现，但我不知道该怎么做。

代码试验:

from selenium import webdriver
from selenium.webdriver.common.by import By

browser = webdriver.Chrome()
browser.get("https://www.instagram.com/p/CYMHMEGBSRT/")
a = browser.find_element(by=By.CLASS_NAME, value="tWeCl")

输出:

https://instagram.fist4-1.fna.fbcdn.net/v/t50.2886-16/271301182_1082110899295465_6686845989868801609_n.mp4?efg=eyJ2ZW5jb2RlX3RhZyI6InZ0c192b2RfdXJsZ2VuLjcyMC5jbGlwcy5iYXNlbGluZSIsInFlX2dyb3VwcyI6IltcImlnX3dlYl9kZWxpdmVyeV92dHNfb3RmXCJdIn0&_nc_ht=instagram.fist4-1.fna.fbcdn.net&_nc_cat=101&_nc_ohc=6RJahYZ39DIAX_ul9E4&edm=AABBvjUBAAAA&vs=453007466354843_3354420889&_nc_vs=HBksFQAYJEdENjZLeERwbE1LVExOZ0RBRWtPNE5YLWNzeGNicV9FQUFBRhUAAsgBABUAGCRHS0ZaS1JCMldIUXZxRzhCQUJ4bFB2ZnVrbE1hYnFfRUFBQUYVAgLIAQAoABgAGwAVAAAmqN%2FFrpms4z8VAigCQzMsF0A%2BmZmZmZmaGBJkYXNoX2Jhc2VsaW5lXzFfdjERAHX%2BBwA%3D&_nc_rid=c8bb85b1e6&ccb=7-4&oe=62408107&oh=00_AT-E77LrFH7G6VVXGeh8bRFQsu95hhQlqUGZdinzFBIUYQ&_nc_sid=83d603"

HTML 的快照:

Answer 1

要打印 src 属性的值，您必须引入 WebDriverWait对于 visibility_of_element_located()您可以使用以下任一项 Locator Strategies :

• 使用 CSS_SELECTOR:

  driver.get('https://www.instagram.com/p/CYMHMEGBSRT/')
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "video.tWeCl"))).get_attribute("src"))
  

• 使用 XPATH:

  driver.get('https://www.instagram.com/p/CYMHMEGBSRT/')
  print(WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//video[@class='tWeCl']"))).get_attribute("src"))
  

• 控制台输出:

  https://instagram.fpnq13-2.fna.fbcdn.net/v/t50.2886-16/271301182_1082110899295465_6686845989868801609_n.mp4?efg=eyJ2ZW5jb2RlX3RhZyI6InZ0c192b2RfdXJsZ2VuLjcyMC5jbGlwcy5iYXNlbGluZSIsInFlX2dyb3VwcyI6IltcImlnX3dlYl9kZWxpdmVyeV92dHNfb3RmXCJdIn0&_nc_ht=instagram.fpnq13-2.fna.fbcdn.net&_nc_cat=101&_nc_ohc=6RJahYZ39DIAX-Iphu9&edm=AABBvjUBAAAA&vs=453007466354843_3354420889&_nc_vs=HBksFQAYJEdENjZLeERwbE1LVExOZ0RBRWtPNE5YLWNzeGNicV9FQUFBRhUAAsgBABUAGCRHS0ZaS1JCMldIUXZxRzhCQUJ4bFB2ZnVrbE1hYnFfRUFBQUYVAgLIAQAoABgAGwAVAAAmqN%2FFrpms4z8VAigCQzMsF0A%2BmZmZmZmaGBJkYXNoX2Jhc2VsaW5lXzFfdjERAHX%2BBwA%3D&_nc_rid=34a08d5a01&ccb=7-4&oe=62408107&oh=00_AT9sh_BH__zjeReDB7lde4t3avzYqDjimTJRnoZi6Lj-TQ&_nc_sid=83d603
  

• 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