更新值不会使用 selenium python 从表中检索

Question

我正在尝试通过在 Python 中使用 Selenium 从以下代码访问 >.

<tbody>
                        <tr>                
                                <td>
    <div class="answer-votes" title="Asked 8 non-wiki questions with a total score of 164. Gave 84 non-wiki answers with a total score of 337." onclick="window.location.href='/search?q=user:37181+[python]'">337</div>
    <a href="/search?q=user:37181+[python]" class="post-tag" title="">python</a>
    <span class="item-multiplier" title="93 posts in the python tag"><span class="item-multiplier-x">×</span>&nbsp;<span class="item-multiplier-count">93</span></span></td>
                                <td>
    <div class="answer-votes" title=" Gave 4 non-wiki answers with a total score of 22." onclick="window.location.href='/search?q=user:37181+[django-templates]'">22</div>
    <a href="/search?q=user:37181+[django-templates]" class="post-tag" title="">django-templates</a>
    <span class="item-multiplier" title="4 posts in the django-templates tag"><span class="item-multiplier-x">×</span>&nbsp;<span class="item-multiplier-count">4</span></span></td>
                                <td>
    <div class="answer-votes" title=" Gave 1 non-wiki answer with a total score of 12." onclick="window.location.href='/search?q=user:37181+[slug]'">12</div>
    <a href="/search?q=user:37181+[slug]" class="post-tag" title="">slug</a>
    </td>
                                <td>
    <div class="answer-votes" title=" Gave 1 non-wiki answer with a total score of 8." onclick="window.location.href='/search?q=user:37181+[google-app-engine]'">8</div>
    <a href="/search?q=user:37181+[google-app-engine]" class="post-tag" title=""><img src="//i.stack.imgur.com/vobok.png" height="16" width="18" alt="" class="sponsor-tag-img">google-app-engine</a>
    </td>
                        </tr>
                        <tr>                
                                <td>
    <div class="answer-votes" title="Asked 1 non-wiki question with a total score of 89. Gave 56 non-wiki answers with a total score of 235." onclick="window.location.href='/search?q=user:37181+[django]'">235</div>
    <a href="/search?q=user:37181+[django]" class="post-tag" title="">django</a>
    <span class="item-multiplier" title="57 posts in the django tag"><span class="item-multiplier-x">×</span>&nbsp;<span class="item-multiplier-count">57</span></span></td>
                                <td>
    <div class="answer-votes" title="Asked 1 non-wiki question with a total score of 21. Gave 1 non-wiki answer with a total score of 22." onclick="window.location.href='/search?q=user:37181+[clang]'">22</div>
    <a href="/search?q=user:37181+[clang]" class="post-tag" title="">clang</a>
    <span class="item-multiplier" title="2 posts in the clang tag"><span class="item-multiplier-x">×</span>&nbsp;<span class="item-multiplier-count">2</span></span></td>
                                <td>
    <div class="answer-votes" title=" Gave 1 non-wiki answer with a total score of 12." onclick="window.location.href='/search?q=user:37181+[connect]'">12</div>
    <a href="/search?q=user:37181+[connect]" class="post-tag" title="show all posts by this user in 'connect'">connect</a>
    </td>
                                <td>
    <div class="answer-votes" title=" Gave 1 non-wiki answer with a total score of 8." onclick="window.location.href='/search?q=user:37181+[memcached]'">8</div>
    <a href="/search?q=user:37181+[memcached]" class="post-tag" title="">memcached</a>
    </td>
                        </tr>
                </tbody>

但是，当编译器移动到下一个<td> 时，我的程序没有显示<td> 的更新值。你能指导我如何解决这个问题吗？这是我的代码：

driver.get("https://stackoverflow.com/users/37181/alex-gaynor?tab=tags")
SMRTable = driver.find_elements_by_xpath("//*[@class='user-tags'] //td")



for i in SMRTable:

    print(i.get_attribute('innerHTML'))
    print(i.find_element_by_xpath("//div[@class='answer-votes']").get_attribute('innerHTML'))
    print(i.find_element_by_xpath("//*[@class='post-tag']").get_attribute('innerHTML'))
    print(i.find_element_by_xpath("//span[@class='item-multiplier-count']").get_attribute('innerHTML'))
    print('\n')

Answer 1

如果您想处理table 中的每个td，您需要在每个XPath 表达式的开头指定点（上下文字符），例如替换

print(i.find_element_by_xpath("//div[@class='answer-votes']").get_attribute('innerHTML'))

与

print(i.find_element_by_xpath(".//div[@class='answer-votes']").get_attribute('innerHTML'))

否则，您将在每次迭代中获得相同的值（仅来自第一个 td 的值）

另外请注意，您不应该使用get_attribute('innerHTML') 来获取节点的文本内容，而是使用text 属性：

print(i.find_element_by_xpath(".//div[@class='answer-votes']").text)

Answer 2

您的代码尝试接近完美。您需要处理一些额外的事情：

• 当你 find_elements_by_xpath() 为 SMRTable 添加 tagName 即 table。
• 在打印 innerHTML 时，当您引用 SMRTable 中的元素时，您必须通过 . 设置引用（点运算符）。
• //div[@class='answer-votes'] 是直接子标签，因此将其更改为 ./div[@class='answer-votes']
• //*[@class='post-tag'] 始终在 <a> 标记内，因此您需要使用 .//a[@class='post-tag']

• 您的有效代码将是：

  driver.get("https://stackoverflow.com/users/37181/alex-gaynor?tab=tags")
  SMRTable = driver.find_elements_by_xpath("//table[@class='user-tags']//tr/td")
  for i in SMRTable:
      print(i.find_element_by_xpath("./div[@class='answer-votes']").get_attribute('innerHTML'))
      print(i.find_element_by_xpath(".//a[@class='post-tag']").get_attribute('innerHTML'))
      print(i.find_element_by_xpath(".//span[@class='item-multiplier-count']").get_attribute('innerHTML'))
  

• 控制台输出：

  337
  python
  93
  22
  django-templates
  4