lxml：cssselect（）：AttributeError：'lxml.etree._Element'对象没有属性'cssselect' [英] lxml: cssselect(): AttributeError: 'lxml.etree._Element' object has no attribute 'cssselect'
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问题描述
有人可以解释为什么第一次调用 root.cssselect（）有效，而第二个失败？
Can someone explain why the first call to root.cssselect() works, while the second fails?
from lxml.html import fromstring
from lxml import etree
html='<html><a href="http://example.com">example</a></html'
root = fromstring(html)
print 'via fromstring', repr(root) # via fromstring <Element html at 0x...>
print root.cssselect("a")
root2 = etree.HTML(html)
print 'via etree.HTML()', repr(root2) # via etree.HTML() <Element html at 0x...>
root2.cssselect("a") # --> Exception
我得到：
Traceback (most recent call last):
File "/home/foo_eins_d/src/foo.py", line 11, in <module>
root2.cssselect("a")
AttributeError: 'lxml.etree._Element' object has no attribute 'cssselect'
版本： lxml == 3.4.4
推荐答案
区别在于元素的类型。示例 -
The difference is in the type of element. Example -
In [12]: root = etree.HTML(html)
In [13]: root = fromstring(html)
In [14]: root2 = etree.HTML(html)
In [15]: type(root)
Out[15]: lxml.html.HtmlElement
In [16]: type(root2)
Out[16]: lxml.etree._Element
lxml.html.HTMLElement 有方法 cssselect（）。此外， HTMLElement 是 etree._Element 的子类。
lxml.html.HTMLElement has the method cssselect() . Also, HTMLElement is a subclass of etree._Element .
但 lxml.etree._Element 没有该方法。
But the lxml.etree._Element does not have that method.
如果你想解析html，你应该使用 lxml.html 。
If you want to parse html, you should use lxml.html.
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