python - Xpath 为空节点值保留一个位置

Question

我尝试从中提取值:

<tr>
     <td>a</td>
     <td>a</td>
     <td>b</td>
     <td></td>
     <td>b</td> 
</tr>

//td/text() 返回:

a
a
b
b

如何获得以下输出？

a
a
b

b

Answer 1

如果您使用lxml.html - 循环找到的td元素并获取text_content():

from lxml.html import fromstring

data = """
<tr>
     <td>a</td>
     <td>a</td>
     <td>b</td>
     <td></td>
     <td>b</td>
</tr>"""

tree = fromstring(data)

for td in tree.xpath(".//td"):
    print(td.text_content())

打印:

a
a
b

b