通过python添加一个类

时间:2011-01-22 12:32:34

标签: python html

有这样的html

somehtml = "<p>Here is my solution: </p><pre><code> some code here </code> </pre> <pre>this is not a code</pre>"

通过python我想将类“foo”添加到包含子<pre>的{​​{1}}标签中,因此我的输出将是:

<code>

我怎样才能做到这一点?

1 个答案:

答案 0 :(得分:4)

使用lxml,可以这样做:

import lxml.html as lh
import io

somehtml = "<p>Here is my solution: </p><pre><code> some code here </code> </pre> <pre>this is not a code</pre>"

doc=lh.parse(io.BytesIO(somehtml))
root=doc.getroot() 
pres=root.xpath('//pre/code/..')

for pre in pres:
    pre.attrib['class']='foo'
print(lh.tostring(root))

产量

<html><body><p>Here is my solution: </p><pre class="foo"><code> some code here </code> </pre> <pre>this is not a code</pre></body></html>