修复Python中破碎的HTML – Beautifulsoup无法正常工作

我有兴趣从这张表中删除文本:
https://ows.doleta.gov/unemploy/trigger/2011/trig_100211.html

以及其他喜欢它的人.

我写了一个快速python脚本,适用于以类似方式格式化的其他表:

    state = ""
    weeks = ""
    edate = "" 
    pdate = url[-11:]
    pdate = pdate[:-5]

    table = soup.find("table") 

    for row in table.findAll('tr'):     
        cells = row.findAll("td")
        if len(cells) == 13: 
            state = row.find("th").find(text=True) 
            weeks = cells[11].find(text=True) 
            edate = cells[12].find(text=True)
            try:   
                print pdate, state, weeks, edate 
                f.writerow([pdate, state, weeks, edate])
            except:  
                print state[1] + " error"  

但是,该脚本不适用于此表,因为标记在一半的行中被破坏.一半行的格式没有标记,以指示行的开头:

</tr> #end of last row, on State0  
<td headers = "State1 no info", attributes> <FONT attributes> text </FONT> </td>
<td headers = "State1 no info", attributes> <FONT attributes> text </FONT> </td>
<td headers = "State1 no info", attributes> <FONT attributes> text </FONT> </td>
<td headers = "State1 no info", attributes> <FONT attributes> text </FONT> </td>
</tr> #theoretically, end of row about State1 

因为一半的行没有正确格式化,所以BeautifulSoup忽略了它们.我已经尝试用整洁来修复问题,但BeautifulSoup在阅读它建议的代码时遇到了问题.我已经考虑通过在正确的位置生成带有标签的新字符串来解决问题,但我不知道该怎么做.

有什么建议?

最佳答案 由于不同的解析器可以随意处理损坏的HTML,因此在尝试自行修复之前,在这些情况下通常可以探索它们是如何实现的.

在这种情况下,您可能对html5lib如何处理这个问题感兴趣 – 它在我看来就像它插入了缺少的< tr>元素而不是丢弃所有孤立的< td>像lxml(默认)这样的元素.

soup = BeautifulSoup(text) #default parser - lxml

soup.table.find_all('tr')[9]
Out[31]: 
<tr bgcolor="#C0C0C0">
<td align="center" headers="Arizona noinfo" width="25"><font size="-2"> </font></td>
<td align="center" headers="Arizona noinfo" width="25"><font size="-2"> </font></td>
<td align="center" headers="Arizona noinfo" width="25"><font size="-2"> </font></td>
<th align="left" id="Arizona " width="100"><font size="-2">Arizona </font></th>
<td align="center" headers="Arizona noinfo" width="50"><font size="-2">2</font></td>
<td align="center" headers="Arizona noinfo" width="50"><font size="-2">2</font></td>
<td align="center" headers="Arizona 13_week_IUR indicators" width="50"><font size="-2">3.03</font></td>
<td align="center" headers="Arizona pct_of_prior_2years indicators" width="50"><font size="-2">79</font></td>
<td align="center" headers="Arizona 3_mo_satur indicators" width="50"><font size="-2">9.3</font></td>
<td align="center" headers="Arizona year pct_of_prior indicators" width="50"><font size="-2">94</font></td>
<td align="center" headers="Arizona 2nd_year pct_of_prior indicators" width="50"><font size="-2">93</font></td>
<td align="center" headers="Arizona 2nd_year pct_of_prior indicators" width="50"><font size="-2">155</font></td>
<td align="center" headers="Arizona avail_wks pct_of_prior indicators noinfo" width="50"><font size="-2"> </font></td>
<td align="center" headers="Arizona dates periods status" width="100"><font size="-2">E 06-11-2011</font></td>
</tr>

soup = BeautifulSoup(text, 'html5lib')

soup.table.find_all('tr')[9] #same path, different result!
Out[33]: 
<tr><td align="center" headers="Alaska noinfo" width="25"><font size="-2"> </font></td>
<td align="center" headers="Alaska noinfo" width="25"><font size="-2"> </font></td>
<td align="center" headers="Alaska noinfo" width="25"><font size="-2"> </font></td>
<th align="left" id="Alaska " width="100"><font size="-2">Alaska </font></th>
<td align="center" headers="Alaska noinfo" width="50"><font size="-2">2</font></td>
<td align="center" headers="Alaska noinfo" width="50"><font size="-2">2</font></td>
<td align="center" headers="Alaska 13_week_IUR indicators" width="50"><font size="-2">3.82</font></td>
<td align="center" headers="Alaska pct_of_prior_2years indicators" width="50"><font size="-2">90</font></td>
<td align="center" headers="Alaska 3_mo_satur indicators" width="50"><font size="-2">7.6</font></td>
<td align="center" headers="Alaska year pct_of_prior indicators" width="50"><font size="-2">96</font></td>
<td align="center" headers="Alaska 2nd_year pct_of_prior indicators" width="50"><font size="-2">95</font></td>
<td align="center" headers="Alaska 2nd_year pct_of_prior indicators" width="50"><font size="-2">117</font></td>
<td align="center" headers="Alaska avail_wks pct_of_prior indicators noinfo" width="50"><font size="-2"> </font></td>
<td align="center" headers="Alaska dates periods status" width="100"><font size="-2">E 06-11-2011</font></td>
</tr>

更多关于bs4 docs:Differences Between Parsers.由于这个表在浏览器中呈现时看起来没问题,并且html5lib尝试以与浏览器相同的方式解析页面,所以这可能是一个安全的选择,这就是你想要的.

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