解析html时,为什么我需要item.text有时和item.text_content()其他 [英] When parsing html why do I need item.text sometimes and item.text_content() others
问题描述
仍在学习lxml。我发现有时我无法使用item.text从树中获取项目的文本。如果我使用item.text_content(),我很好去。我不确定我明白为什么。任何提示,将不胜感激
好吧我不确定如何提供一个例子,而无需处理文件:
这里是我写的一些代码,试图找出为什么我没有收到我期望的文本:
theTree = html.fromstring(open(notmatched [0])。read())
text = []
text_content = []
notText = []
hasText = []
为每个在theTree.iter()中:
如果each.text:
text.append(each.text)
hasText.append(each)#每个文本元素列表.text是true
text_content.append(each.text_content())#所有元素的文本
如果每个元素都不在hasText中:
notText.append(each)
所以在我运行这个命令后,我看看
>>> len(notText)
3612
>>> notText [40]
< 26ab650处的元素b>
>>> notText [40] .text_content()
'(IRS Employer'
>>> notText [40] .text
按照文档 text_content
方法:
返回元素的文本内容,包括
其子元素的文本内容,没有标记。
例如, / p>
import lxml.html as lh
data =< a>< b>< c> < / a>
doc = lh.fromstring(data)
print(doc)
#<元素a at b76eb83c>
doc
是元素
a
。 a
code>< a> 和< b>
所以 doc.text
无
:
print(doc.text)
#None
但是在 c
标记后面有文本,所以 doc.text_content()
不是无
:
print(doc.text_content())
#blah
PS。对文本
属性的含义有一个清晰的描述此处。虽然它是 lxml.etree.Element
文档的一部分,但我认为文本
和 tail
属性同样适用于 lxml.html.Element
对象。
Still learning lxml. I discovered that sometimes I cannot get to the text of an item from a tree using item.text. If I use item.text_content() I am good to go. I am not sure I see why yet. Any hints would be appreciated
Okay I am not sure exactly how to provide an example without making you handle a file:
here is some code I wrote to try to figure out why I was not getting some text I expected:
theTree=html.fromstring(open(notmatched[0]).read())
text=[]
text_content=[]
notText=[]
hasText=[]
for each in theTree.iter():
if each.text:
text.append(each.text)
hasText.append(each) # list of elements that has text each.text is true
text_content.append(each.text_content()) #the text for all elements
if each not in hasText:
notText.append(each)
So after I run this I look at
>>> len(notText)
3612
>>> notText[40]
<Element b at 26ab650>
>>> notText[40].text_content()
'(I.R.S. Employer'
>>> notText[40].text
Accordng to the docs the text_content
method:
Returns the text content of the element, including the text content of its children, with no markup.
So for example,
import lxml.html as lh
data = """<a><b><c>blah</c></b></a>"""
doc = lh.fromstring(data)
print(doc)
# <Element a at b76eb83c>
doc
is the Element
a
. The a
tag has no text immediately following it (between the <a>
and the <b>
. So doc.text
is None
:
print(doc.text)
# None
but there is text after the c
tag, so doc.text_content()
is not None
:
print(doc.text_content())
# blah
PS. There is a clear description of the meaning of the text
attribute here. Although it is part of the docs for lxml.etree.Element
, I think the meaning of the text
and tail
attributes applies equally well to lxml.html.Element
objects.
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