我有一个非常大的 html 文件。 我需要抓取这个 html 文件并提取某些信息
soup.findAll('table',{"summary" : "This table displays snapshot information"})
[<table border="1" summary="This table displays snapshot information" width="500">
<tbody><tr><th class="awrnobg" scope="col"></th><th class="awrbg" scope="col">Snap Id</th><th class="awrbg" scope="col">Snap Time</th><th class="awrbg" scope="col">Sessions</th><th class="awrbg" scope="col">Cursors/Session</th></tr>
<tr><td class="awrnc" scope="row">Begin Snap:</td><td align="right" class="awrnc">98810</td><td align="center" class="awrnc">29-Jun-15 08:00:02</td><td align="right" class="awrnc">700</td><td align="right" class="awrnc"> 129.6</td></tr>
<tr><td class="awrc" scope="row">End Snap:</td><td align="right" class="awrc">98864</td><td align="center" class="awrc">29-Jun-15 17:00:23</td><td align="right" class="awrc">703</td><td align="right" class="awrc"> 129.1</td></tr>
<tr><td class="awrnc" scope="row">Elapsed:</td><td class="awrnc"> </td><td align="center" class="awrnc"> 540.35 (mins)</td><td class="awrnc"> </td><td class="awrnc"> </td></tr>
<tr><td class="awrc" scope="row">DB Time:</td><td class="awrc"> </td><td align="center" class="awrc"> 2,963.17 (mins)</td><td class="awrc"> </td><td class="awrc"> </td></tr>
</tbody></table>]
用漂亮的汤我设法得到了一份 list 。 但我需要提取日期 29-Jun-15 08:00:02 任何想法 我可以单独操作列表项，但这对我来说很难看。
请您参考如下方法:
只需使用其类 搜索td。它应该返回一个列表，您可以从那里继续。
from bs4 import BeautifulSoup as bsoup
html = """<table border="1" summary="This table displays snapshot information" width="500">
<tbody><tr><th class="awrnobg" scope="col"></th><th class="awrbg" scope="col">Snap Id</th><th class="awrbg" scope="col">Snap Time</th><th class="awrbg" scope="col">Sessions</th><th class="awrbg" scope="col">Cursors/Session</th></tr>
<tr><td class="awrnc" scope="row">Begin Snap:</td><td align="right" class="awrnc">98810</td><td align="center" class="awrnc">29-Jun-15 08:00:02</td><td align="right" class="awrnc">700</td><td align="right" class="awrnc"> 129.6</td></tr>
<tr><td class="awrc" scope="row">End Snap:</td><td align="right" class="awrc">98864</td><td align="center" class="awrc">29-Jun-15 17:00:23</td><td align="right" class="awrc">703</td><td align="right" class="awrc"> 129.1</td></tr>
<tr><td class="awrnc" scope="row">Elapsed:</td><td class="awrnc"> </td><td align="center" class="awrnc"> 540.35 (mins)</td><td class="awrnc"> </td><td class="awrnc"> </td></tr>
<tr><td class="awrc" scope="row">DB Time:</td><td class="awrc"> </td><td align="center" class="awrc"> 2,963.17 (mins)</td><td class="awrc"> </td><td class="awrc"> </td></tr>
</tbody></table>"""
soup = bsoup(html)
print soup.find_all('td', class_='awrnc')[2].get_text()
# 29-Jun-15 08:00:02
编辑:
考虑到您返回表列表的原始代码，只需使用正常的列表索引/切片来获取您想要的表。请参阅我的以下示例。我将上面的 HTML 更改为具有三个具有相同 summary 属性的 table。我的代码将返回所有三个，因此我将选择第一个。然后，我将查找与我定义的 class 匹配的所有 td。然后，我将使用 [2] 选择第三个。然后，我将使用 get_text() 获取目标 td 元素内的值。
from bs4 import BeautifulSoup as bsoup
html = """<html><body><table border="1" summary="This table displays snapshot information" width="500">
<tbody><tr><th class="awrnobg" scope="col"></th><th class="awrbg" scope="col">Snap Id</th><th class="awrbg" scope="col">Snap Time</th><th class="awrbg" scope="col">Sessions</th><th class="awrbg" scope="col">Cursors/Session</th></tr>
<tr><td class="awrnc" scope="row">Begin Snap:</td><td align="right" class="awrnc">98810</td><td align="center" class="awrnc">29-Jun-15 08:00:02</td><td align="right" class="awrnc">700</td><td align="right" class="awrnc"> 129.6</td></tr>
<tr><td class="awrc" scope="row">End Snap:</td><td align="right" class="awrc">98864</td><td align="center" class="awrc">29-Jun-15 17:00:23</td><td align="right" class="awrc">703</td><td align="right" class="awrc"> 129.1</td></tr>
<tr><td class="awrnc" scope="row">Elapsed:</td><td class="awrnc"> </td><td align="center" class="awrnc"> 540.35 (mins)</td><td class="awrnc"> </td><td class="awrnc"> </td></tr>
<tr><td class="awrc" scope="row">DB Time:</td><td class="awrc"> </td><td align="center" class="awrc"> 2,963.17 (mins)</td><td class="awrc"> </td><td class="awrc"> </td></tr>
</tbody></table><table summary="This table displays snapshot information"></table><table summary="This table displays snapshot information"></table><body><html>"""
soup = bsoup(html)
list_of_tables = soup.find_all("table", {"summary":"This table displays snapshot information"}) # This will return 3 tables based on the above HTML.
target_table = list_of_tables[0] # Target the first one.
list_of_tds = target_table.find_all('td', class_='awrnc')
target_td = list_of_tds[2]
target_value = target_td.get_text()
print target_value
# 29-Jun-15 08:00:02
TL;DR:只需在列表中使用 [0]。似乎这是您无论如何都能找到的唯一一张 table 。之后，您可以再次在其中搜索，因为它变成了有效的 BeautifulSoup HTML 字符串。
