Python Beautifulsoup解析html

Question

我正在嘗試使用BeautifulSoup4解析html：

<tr  class="odd" >
<td><a href="show_result.php?id=7084083" title="Show the User ID DB records for the id '7084083'"  tabindex="5" >7084083</A></td>
<td><a href="show_result.php?name=bernd" title="Show the User ID DB records the name 'bernd'"   >bernd</A></td>
<td><a href="show_result.php?range=DDF+User" title="range_link"   >DDF User</A></td>
<td>mandatory</td>
<td>Solaris</td>
<td>valid</td>
<!-- xxxx old style  -->
<!-- xxxx showdetail navlink -->
<td><a class="navlink" href="show_detail.php?rec_id=283330130"  title="show the detail for this entry [alt-E]" accesskey="E"><img src="detail.gif" alt="show the detail for this entry [alt-E]" title="show the detail for this entry [alt-E]" border="0">&nbsp;</a></td>
</tr>

我想過濾掉第一個“ id = 7084083” =>（7084083）

Answer 1

由於您正在搜索html的特定部分，因此使用re代替bs4可能更容易：

import re
s = """
<tr  class="odd" >
<td><a href="show_result.php?id=7084083" title="Show the User ID DB records for the id '7084083'"  tabindex="5" >7084083</A></td>
<td><a href="show_result.php?name=bernd" title="Show the User ID DB records the name 'bernd'"   >bernd</A></td>
<td><a href="show_result.php?range=DDF+User" title="range_link"   >DDF User</A></td>
<td>mandatory</td>
<td>Solaris</td>
<td>valid</td>
<!-- xxxx old style  -->
<!-- xxxx showdetail navlink -->
<td><a class="navlink" href="show_detail.php?rec_id=283330130"  title="show the detail for this entry [alt-E]" accesskey="E"><img src="detail.gif" alt="show the detail for this entry [alt-E]" title="show the detail for this entry [alt-E]" border="0">&nbsp;</a></td>
</tr>
"""
final_id = re.findall('(?<=id\=)\d+', s)[0]

輸出：

'7084083'