html - 如何使用 lxml 根据变量列表解析 HTML 表？

Question

我正在尝试使用 lxml 解析 HTML 表。而rows = outhtml.xpath('//tr/td/span[@class="boldred"]/text()')获取结果，我尝试仅在列内容以配置文件中的变量开头时提取列内容。例如，如果 <td>从“Street 1”开始，然后我想抓取 <span>内容<td>标签。这样，我就可以拥有一个元组的元组(它负责 None 值)，然后将其存储在数据库中。

lxml_parse.py

import lxml.html as lh

doc=open('test.htm', 'r')
outhtml=lh.parse(doc)
doc.close()

rows = outhtml.xpath('//tr/td/span[@class="boldred"]/text()')
print rows

test.htm

<tr>

    <td></td>

    <td colspan="2">

        Street 1:<span class="required"> *</span><br />

        <span class="boldred">2100 5th Ave</span>

    </td>

    <td colspan="2">

        Street 2:<br />

        <span class="boldred">Ste 202</span>

    </td>

</tr>

<tr>

    <td></td>

    <td>

        City:<span class="required"> *</span><br />

        <span class="boldred">NYC</span>

    </td>

    <td>

        State:<br />

        <SPAN CLASS="boldred2"></SPAN><br/><SPAN CLASS="boldred">NY</SPAN>

    </td>

    <td>

        Country:<span class="required"> *</span><br />

        <SPAN CLASS="boldred2"></SPAN><br/><SPAN CLASS="boldred">USA</SPAN>

    </td>

    <td>

        Zip:<br />

        <span class="boldred">10022</span>

    </td>

</tr>

输出:

$ python lxml_parse.py 
['2100 5th Ave', 'Ste 202', 'NYC', 'NY', 'USA', '10022']

解析一堆变量是我遇到的问题:

import lxml.html as lh

desiredvars = ['Street 1','Street 2','City', 'State', 'Zip']

doc=open('test.htm', 'r')
outhtml=lh.parse(doc)
doc.close()

myresultset = ((var, outhtml.xpath('//tr/td[child::*[text()=var]]/span[@class="boldred"]/text()')) for var in desiredvars)
print myresultset

Answer 1

旨在制作这本词典:

{'City:': 'NYC', 
 'Zip:': '10022', 
 'Street 1:': '2100 5th Ave', 
 'Country:': 'USA', 
 'State:': 'NY', 
 'Street 2:': 'Ste 202'}

您可以使用此代码。然后就可以很容易地查询字典来获取你想要的值:

import lxml.html as lh

test = '''<tr>
    <td></td>
    <td colspan="2">
        Street 1:<span class="required"> *</span><br />
        <span class="boldred">2100 5th Ave</span>
    </td>
    <td colspan="2">
        Street 2:<br />
        <span class="boldred">Ste 202</span>
    </td>
</tr>
<tr>
    <td></td>
    <td>
        City:<span class="required"> *</span><br />
        <span class="boldred">NYC</span>
    </td>
    <td>
        State:<br />
        <SPAN CLASS="boldred2"></SPAN><br/><SPAN CLASS="boldred">NY</SPAN>
    </td>
    <td>
        Country:<span class="required"> *</span><br />
        <SPAN CLASS="boldred2"></SPAN><br/><SPAN CLASS="boldred">USA</SPAN>
    </td>
    <td>
        Zip:<br />
        <span class="boldred">10022</span>
    </td>
</tr>'''

outhtml = lh.fromstring(test)
ks = [ k.strip() for k in outhtml.xpath('//tr/td/text()') if k.strip() != '' ]
vs = outhtml.xpath('//tr/td/span[@class="boldred"]/text()')

result = dict( zip(ks,vs) )

print result