如何从python中的字符串中提取某些信息？

Question

I am trying to use python to extract certain information from html code. for example:

<a href="#tips">Visit the Useful Tips Section</a> 
and I would like to get result : Visit the Useful Tips Section

<div id="menu" style="background-color:#FFD700;height:200px;width:100px;float:left;">
<b>Menu</b><br />
HTML<br />
CSS<br />
and I would like to get Menu HTML CSS

In other word, I wish to get everything between <>and<> I am trying to write a python function that takes the html code as a string, and then extract information from there. I am stuck at string.split('<').

Answer 1

您应该使用适当的HTML解析库，例如HTMLParser模块。

Answer 2

string = '<a href="#tips">Visit the Useful Tips Section</a>'
re.findall('<[^>]*>(.*)<[^>]*>', string) //return 'Visit the Useful Tips Section'

Answer 3

You can use lxml html parser.

>>> import lxml.html as lh
>>> st = ''' load your above html content into a string '''
>>> d = lh.fromstring(st)
>>> d.text_content()

'Visit the Useful Tips Section \nand I would like to get result : Visit the Useful Tips Section\n\n\nMenu\nHTML\nCSS\nand I would
like to get Menu HTML CSS\n'

or you can do

>>> for content in d.text_content().split("\n"):
...     if content:
...             print content
...
Visit the Useful Tips Section
and I would like to get result : Visit the Useful Tips Section
Menu
HTML
CSS
and I would like to get Menu HTML CSS
>>>

Answer 4

I understand you are trying to strip out the HTML tags and keep only the text.

You can define a regular expression that represents the tags. Then substitute all matches with the empty string.

Example:

def remove_html_tags(data):
    p = re.compile(r'<.*?>')
    return p.sub('', data)

References:

Example

Docs about python regular expressions

Answer 5

我会使用BeautifulSoup-格式错误的html会减少胡思乱想。