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[英]Parsing HTML tree in lxml : how can I retrieve the text inside the element?
[英]Parsing HTML to get text inside an element
我需要將兩個元素中的文本轉換為字符串:
source_code = """<span class="UserName"><a href="#">Martin Elias</a></span>"""
>>> text
'Martin Elias'
我怎么能實現這個目標?
我搜索了“python parse html”,這是第一個結果: https : //docs.python.org/2/library/htmlparser.html
此代碼取自python docs
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>')
結果如下:
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
使用它並查看HTMLParser中的代碼我想出了這個:
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 = []
你可以像這樣使用它:
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
現在,您應該能夠輕松地從這些列表中提取數據。 我希望這有幫助!
我建議使用Python Beautiful Soup 4庫。
pip install beautifulsoup4
它使HTML解析非常簡單。
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'
安裝beautifulsoup,您可以這樣做:
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
您也可以嘗試使用html5lib和XPath, 這里有一個很好的問題 ,該答案有一個重要的細節( namespaceHTMLElements
),以記住使html5lib按預期運行。 我浪費了太多時間試圖讓它發揮作用,因為我忽略了我需要改變它。
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