使用 BeautifulSoup 从标签中提取字符串

问题描述

我试图从下表中提取.我在第二个 <td> 之后剪掉了它，后面还有六个.需要提取所有八个字符串，例如在下面的示例中，我想要值 61.5、56.43 等

I am trying to extract from below table. I cut it after the second <td>, with six more to follow. All eight strings need to be extracted, e.g. in the example below I would want the values 61.5, 56.43, etc.

下面的代码只给了我第一个值，61.5.我怎样才能得到剩余的值?

The code below only gives me the first value, 61.5. How can I get the remaining values?

 soup.find("div", {"class":"value"}).text


<td class="flow">
    <div class="heading" style="min-height: 63px;">Dornum</div>
    <div class="data"><div class="value">61.5</div> MSm<sup>3</sup>/d</div>
</td>
<td class="flow">
    <div class="heading" style="min-height: 63px;">Emden EMS</div>
    <div class="data"><div class="value">56.43</div> MSm<sup>3</sup>/d</div>
</td>

推荐答案

使用 soup.find_all() 获取匹配元素列表，然后抓取 text 属性对于每个元素:

Use soup.find_all() to obtain a list of matching elements, then grab the text attribute for each element:

from bs4 import BeautifulSoup

html = '''<td class="flow">
    <div class="heading" style="min-height: 63px;">Dornum</div>
    <div class="data"><div class="value">61.5</div> MSm<sup>3</sup>/d</div>
</td>
<td class="flow">
    <div class="heading" style="min-height: 63px;">Emden EMS</div>
    <div class="data"><div class="value">56.43</div> MSm<sup>3</sup>/d</div>
</td>'''

soup = BeautifulSoup(html)

data = [element.text for element in soup.find_all("div", "value")]

>>> data
[u'61.5', u'56.43']

或者，如果你想要它们作为浮点数:

Or, if you want them as floats:

data = [float(element.text) for element in soup.find_all("div", "value")]
>>> data
[61.5, 56.43]

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