Question

我正在尝试使用Python中的Selenium从以下代码访问> 。 <之间的数据。

<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，当编译器移至下一个<td>时，我的程序未显示<td>的更新值。您能否指导我如何解决此问题？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

如果要处理td中的每个table，则需要在每个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）

还请注意，您不应使用get_attribute('innerHTML')来获取节点的文本内容，而应使用text属性：

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

Answer 2

您的代码尝试几乎是完美的。您还需要注意一些其他事项：

您find_elements_by_xpath()使用 SMRTable 时，请添加 tagName ，即table。
在引用 SMRTable 中的元素时打印 innerHTML 时，必须通过 . 设置引用（ dot 运算符）。
//div[@class='answer-votes']是直接子标记，因此将其更改为./div[@class='answer-votes']
//*[@class='post-tag']始终位于<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
```

使用硒Python无法从表中检索更新值

2 个答案: