有人可以解释一下为什么第一次打电话给root.cssselect()有效，而第二个失败了？
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
I get:
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
区别在于元素的类型。例子 -
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 http://lxml.de/api/lxml.html.HtmlElement-class.html有方法cssselect()。还，HTMLElement是一个子类etree._Element .
But the lxml.etree._Element http://lxml.de/api/lxml.etree._Element-class.html没有那个方法。
如果你想解析html，你应该使用lxml.html.
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