美丽的汤捕获表中的空值 [英] beautiful soup captures null values in a table

问题描述

对于下面的HTML代码，我使用beautifulsoup来捕获表格信息：

For the following piece of HTML code, I used beautifulsoup to capture the table information:

<table>
<tr>
<td><b>Code</b></td>
<td><b>Display</b></td>
</tr>
<tr>
<td>min</td>
<td>Minute</td><td/>
</tr>
<tr>
<td>happy </td>
<td>Hour</td><td/>
</tr>
<tr>
<td>daily </td>
<td>Day</td><td/>
</tr>

这是我的代码：

comments = [td.get_text()  for td in table.findAll("td")]
Comments=[data.encode('utf-8')  for data in comments] 

如您所见，此表有两个标题：代码和显示以及行中的某些值。我的代码的预期输出应该是[代码，显示，分钟，分钟，快乐，小时，每日，每天]

As you see, this table has two headers: "code and display" and some values in rows. The expected output of my code should be [code, display, min, minutes, happy, Hour, daily, day]

但这是输出：

['Code', 'Display', 'min', 'Minute', '', 'happy ', 
'Hour', '', 'daily ', 'Day', '']

输出有''在此表中未定义的注释中的第5，第8和第11个索引。我认为这可能是因为< / td>< td /> 。
如何更改代码以不在输出中捕获u''？

The output has '' in 5th, 8th, and 11th indices in comments that are not defined in this table. I think it may because of </td><td/>. How can I change the code to not capture u'' in the output?

推荐答案

抱歉，我没有仔细阅读你的问题。你是对的，问题是空的< td /> 标签。只需将您的生成器调整为仅包含带有文本的单元格：

Sorry, I hadn't read your question carefully enough. You're right, the problem is the empty <td/> tags. Just adjust your generator to only include cells with text:

comments = [td.get_text() for td in table.findAll('td') if td.text]

---

编辑：我怀疑这是最有效的方法，但这只包括在第一行中有文字或相应的td的tds。

---

I doubt this is the most efficient way to do it, but this will only include tds that have either text or a corresponding td in the first row.

ths = table.tr.find_all('td')
tds_in_row = len(table.tr.next_sibling.find_all('td'))

tds = [
    td.get_text()
    for i, td in enumerate(table.find_all('td'))
    if len(ths) > (i + 1) % tds_in_row or td.text
]

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