urllib获取到的内容转为 BeautifulSoup bs4对象后内容发生变化
http://samsung-updates.com/device/?id=SM-N9007
这个网址用linux curl和直接用urllib获取到的内容都是正常的，主要关注 table id="flist" 节点的内容如下：
<table id="flist" border="0" width="100%" class="nosort">
<tr>
<td class="sorttable_nosort" colspan="2" width="13%"><center><b>Device Name</b></center></td>
<td width="80" class="sorttable_nosort"><b><center>Model</center></b></td>
<td width="20"><b><center>Region</center></b></td>
<td align="center" class="sorttable_nosort"><b><center>Version</center></b></td>
<td align="center"><b><center>OS</center></b></td>
<td align="center" class="sorttable_nosort"><b><center>OS Version</center></b></td>
<td align="center"><b><center>Build Date</center></b></td>
<td align="center"><b><center>Changelist</center></b></td>
<td align="center" class="sorttable_nosort"><b><center>Unlock</center></a></td>
<td align="center" class="sorttable_nosort"><b><center> </center></b></td>
</tr>
<tr>
<td align="left" colspan="2">Galaxy Note 3 (Snapdragon/SM-N9007)</td>
<td align="center"><a href="http://samsung-updates.com/device/?id=SM-N9007&details=Galaxy_Note_3__Snapdragon_and_SM-N9007">SM-N9007</a></td>
<td align="center"><a href="http://samsung-updates.com/region/?region=TGY" class="tooltip">TGY<span><b>Hong kong</b></span></a></td>
<td align="center">N9007ZHU3ANG2</td>
<td align="center"><img src="http://live.samsung-updates.com/44.png" border="0" width="32" height="22" alt="Android" title="KitKat" /></td>
<td align="center">4.4.2</td>
<td align="center">10.07.2014</td>
<td align="center">2188588</td>
<td align="center"><a href="http://www.unlocksamsungonline.com/samsung-SM-N9007-unlock-codes/">Unlock</a></td>
<td align="center"> <a href="/details/31397/Galaxy_Note_3_Snapdragon/SM-N9007/SM-N9007/TGY/N9007ZHU3ANG2.html" title="Download from Hotfile Mirror"><img src="http://samsung-updates.com/dbut.png" alt="Download File" width="90" height="35" /></a></td>
</tr>
但如果将获取到的内容转成bs4对象，获取的内容就不对了。请参见以下代码：
import urllib.request
from bs4 import BeautifulSoup
def get_dom(page_url,encoding):
opener = urllib.request.build_opener()
opener.addheaders = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686) Gecko/20071127 Firefox/2.0.0.11')]
dom = opener.open(page_url)
return dom.read().decode(encoding)
dom.close()
def get_post_content(post_url):
soup_post = BeautifulSoup(get_dom(post_url,"utf-8"))
print(soup_post)
get_post_content("http://samsung-updates.com/device/?id=SM-N9007")
print出来的内容变成了：
<table border="0" class="nosort" id="flist" width="100%">
<tr>
<td class="sorttable_nosort" colspan="2" width="13%"><center><b>Device Name</b></center></td>
<td class="sorttable_nosort" width="80"><b><center>Model</center></b></td>
<td width="20"><b><center>Region</center></b></td>
<td align="center" class="sorttable_nosort"><b><center>Version</center></b></td>
<td align="center"><b><center>OS</center></b></td>
<td align="center" class="sorttable_nosort"><b><center>OS Version</center></b></td>
<td align="center"><b><center>Build Date</center></b></td>
<td align="center"><b><center>Changelist</center></b></td>
<td align="center" class="sorttable_nosort"><b><center>Unlock</center></b></td></tr></table>
</div></div></div></div>
<td align="center" class="sorttable_nosort"><b><center> </center></b></td>
<tr>
<td align="left" colspan="2">Galaxy Note 3 (Snapdragon/SM-N9007)</td>
<td align="center"><a href="http://samsung-updates.com/device/?id=SM-N9007&details=Galaxy_Note_3__Snapdragon_and_SM-N9007">SM-N9007</a></td>
<td align="center"><a class="tooltip" href="http://samsung-updates.com/region/?region=TGY">TGY<span><b>Hong kong</b></span></a></td>
<td align="center">N9007ZHU3ANG2</td>
<td align="center"><img alt="Android" border="0" height="22" src="http://live.samsung-updates.com/44.png" title="KitKat" width="32"/></td>
<td align="center">4.4.2</td>
<td align="center">10.07.2014</td>
<td align="center">2188588</td>
<td align="center"><a href="http://www.unlocksamsungonline.com/samsung-SM-N9007-unlock-codes/">Unlock</a></td>
<td align="center"> <a href="/details/31397/Galaxy_Note_3_Snapdragon/SM-N9007/SM-N9007/TGY/N9007ZHU3ANG2.html" title="Download from Hotfile Mirror"><img alt="Download File" height="35" src="http://samsung-updates.com/dbut.png" width="90"/></a></td>
</tr>
请注意第一个tr节点后，table闭合了，还有有很多div闭合的标记。
这个问题导致我没法正确抓取表格的内容，求教下是不是我哪里有问题？
人形自走推妹机
10 years, 3 months ago
Answers
这是因为BeautifulSoup默认使用的HTML解析器（即标准库里的那个）对你的页面解析出错。解决方法是换一个解析器。
参见 http://www.crummy.com/software/BeautifulSoup/bs4/doc/index.zh.html
P.S. 我用Python3.4，装了html5lib，并且在代码里用BeautifulSoup(xxx, 'html5lib')可以正确获得你想要的东西。
再P.S. 现在比较流行的html解析库是PyQuery，因为它的语法跟jQuery很像，很容易上手。而http库一般用requests，也是因为它提供的api很简单
import requests
from pyquery import PyQuery as pq
def html(url):
return requests.get(url).text
def table(text):
return pq(text)('table#flist')
def table_from_url(url):
return pq(url=url)('table#flist')
if __name__ == '__main__':
print(table(html('http://samsung-updates.com/device/?id=SM-N9007')))
# or
print(table_from_url('http://samsung-updates.com/device/?id=SM-N9007'))
奔跑的小欣
answered 10 years, 3 months ago