解析HTML得到一个元素中的文本(Parsing HTML to get text inside a

2019-07-30 19:00发布

我需要两个元素成一个字符串中的文本:

source_code = """<span class="UserName"><a href="#">Martin Elias</a></span>"""

>>> text
'Martin Elias'

我怎么能做到这一点?

Answer 1:

我搜索“蟒蛇解析HTML”,这是第一个结果: https://docs.python.org/2/library/htmlparser.html

此代码是从Python文档拍摄

from HTMLParser import HTMLParser

    # create a subclass and override the handler methods
    class MyHTMLParser(HTMLParser):
        def handle_starttag(self, tag, attrs):
            print "Encountered a start tag:", tag
        def handle_endtag(self, tag):
            print "Encountered an end tag :", tag
        def handle_data(self, data):
            print "Encountered some data  :", data

    # instantiate the parser and fed it some HTML
    parser = MyHTMLParser()
    parser.feed('<html><head><title>Test</title></head>'
                '<body><h1>Parse me!</h1></body></html>')

下面是结果:

Encountered a start tag: html
Encountered a start tag: head
Encountered a start tag: title
Encountered some data  : Test
Encountered an end tag : title
Encountered an end tag : head
Encountered a start tag: body
Encountered a start tag: h1
Encountered some data  : Parse me!
Encountered an end tag : h1
Encountered an end tag : body
Encountered an end tag : html

使用这种和通过查看HTMLParser的代码我想出了这一点:

class myhtmlparser(HTMLParser):
    def __init__(self):
        self.reset()
        self.NEWTAGS = []
        self.NEWATTRS = []
        self.HTMLDATA = []
    def handle_starttag(self, tag, attrs):
        self.NEWTAGS.append(tag)
        self.NEWATTRS.append(attrs)
    def handle_data(self, data):
        self.HTMLDATA.append(data)
    def clean(self):
        self.NEWTAGS = []
        self.NEWATTRS = []
        self.HTMLDATA = []

您可以使用它像这样:

from HTMLParser import HTMLParser

pstring = source_code = """<span class="UserName"><a href="#">Martin Elias</a></span>"""


class myhtmlparser(HTMLParser):
    def __init__(self):
        self.reset()
        self.NEWTAGS = []
        self.NEWATTRS = []
        self.HTMLDATA = []
    def handle_starttag(self, tag, attrs):
        self.NEWTAGS.append(tag)
        self.NEWATTRS.append(attrs)
    def handle_data(self, data):
        self.HTMLDATA.append(data)
    def clean(self):
        self.NEWTAGS = []
        self.NEWATTRS = []
        self.HTMLDATA = []

parser = myhtmlparser()
parser.feed(pstring)

# Extract data from parser
tags  = parser.NEWTAGS
attrs = parser.NEWATTRS
data  = parser.HTMLDATA

# Clean the parser
parser.clean()

# Print out our data
print tags
print attrs
print data

现在,你应该能够很容易地从这些名单中提取数据。 我希望这有助于!



Answer 2:

我建议使用Python 美丽的汤4库。

pip install beautifulsoup4

它使HTML解析很容易。

from bs4 import BeautifulSoup
source_code = """<span class="UserName"><a href="#">Martin Elias</a></span>"""
soup = BeautifulSoup(source_code)
print soup.a.string
>>> 'Martin Elias'


Answer 3:

安装beautifulsoup,你可以这样做:

from BeautifulSoup import  BeautifulSoup
source_code = '"""<span class="UserName"><a href="#">Martin Elias</a></span>"""'
soup = BeautifulSoup(source_code)
print soup.find('span',{'class':'UserName'}).text


Answer 4:

您也可以尝试使用html5lib和XPath, 有关于它在这里一个很好的问题 ,这个问题的答案有一个重要的细节( namespaceHTMLElements )要记住,使html5lib像预期的那样。 我浪费了这么多时间的努力得到它的工作,因为我忽略了,我需要改变这种状况。



文章来源: Parsing HTML to get text inside an element