如何使用美丽汤从页面中提取链接 [英] How to extract links from a page using Beautiful soup

问题描述

我有一个 HTML页面，其中包含多个div，例如:

I have a HTML Page with multiple divs like:

<div class="post-info-wrap">
  <h2 class="post-title"><a href="https://www.example.com/blog/111/this-is-1st-post/" title="Example of 1st post &#8211; Example 1 Post" rel="bookmark">sample post &#8211; example 1 post</a></h2>
  <div class="post-meta clearfix">

    <div class="post-info-wrap">
      <h2 class="post-title"><a href="https://www.example.com/blog/111/this-is-2nd-post/" title="Example of 2nd post &#8211; Example 2 Post" rel="bookmark">sample post &#8211; example 2 post</a></h2>
      <div class="post-meta clearfix">

我需要使用class post-info-wrap获取所有div的值，我是BeautifulSoup的新手

and I need to get the value for all the divs with class post-info-wrap I am new to BeautifulSoup

所以我需要这些网址:

• https://www.example.com/blog/111/this-is-1st-post/

https://www.example.com/blog/111/this-is-2nd-post/

以此类推...

我尝试过:

import re
import requests
from bs4 import BeautifulSoup

r = requests.get("https://www.example.com/blog/author/abc") 
data = r.content  # Content of response

soup = BeautifulSoup(data, "html.parser")
for link in soup.select('.post-info-wrap'):
   print link.find('a').attrs['href']

此代码似乎无效.我是美丽汤的新手.如何提取链接?

This code doesnt seem to be working. I am new to beautiful soup. How can i extract the links?

推荐答案

link = i.find('a'，href = True)始终不返回 anchor标签(a)，它可能返回 NoneType ，因此您需要验证链接是否为None，继续循环，否则获取链接href值.

link = i.find('a',href=True) always not return anchor tag (a), it may be return NoneType, so you need to validate link is None, continue for loop,else get link href value.

按网址取消链接:

import re
import requests
from bs4 import BeautifulSoup
r = requests.get("https://www.example.com/blog/author/abc")
data = r.content  # Content of response
soup = BeautifulSoup(data, "html.parser")

for i in soup.find_all('div',{'class':'post-info-wrap'}):
   link = i.find('a',href=True)
   if link is None:
       continue
   print(link['href'])

通过HTML取消链接:

from bs4 import BeautifulSoup
html = '''<div class="post-info-wrap"><h2 class="post-title"><a href="https://www.example.com/blog/111/this-is-1st-post/" title="Example of 1st post &#8211; Example 1 Post" rel="bookmark">sample post &#8211; example 1 post</a></h2><div class="post-meta clearfix">
<div class="post-info-wrap"><h2 class="post-title"><a href="https://www.example.com/blog/111/this-is-2nd-post/" title="Example of 2nd post &#8211; Example 2 Post" rel="bookmark">sample post &#8211; example 2 post</a></h2><div class="post-meta clearfix">'''

soup = BeautifulSoup(html, "html.parser")

for i in soup.find_all('div',{'class':'post-info-wrap'}):
   link = i.find('a',href=True)
   if link is None:
       continue
   print(link['href'])

更新:

from bs4 import BeautifulSoup
from selenium import webdriver

driver = webdriver.Chrome('/usr/bin/chromedriver')
driver.get("https://www.example.com/blog/author/abc")

soup = BeautifulSoup(driver.page_source, "html.parser")

for i in soup.find_all('div', {'class': 'post-info-wrap'}):
    link = i.find('a', href=True)
    if link is None:
        continue
    print(link['href'])

O/P:

https://www.example.com/blog/911/article-1/
https://www.example.com/blog/911/article-2/
https://www.example.com/blog/911/article-3/
https://www.example.com/blog/911/article-4/
https://www.example.com/blog/random-blog/article-5/

对于Chrome浏览器:

http://chromedriver.chromium.org/downloads

为Chrome浏览器安装Web驱动程序:

https://christopher.su/2015/selenium-chromedriver-ubuntu/

硒教程

https://selenium-python.readthedocs.io/

其中'/usr/bin/chromedriver' chrome webdriver路径.

Where '/usr/bin/chromedriver' chrome webdriver path.

这篇关于如何使用美丽汤从页面中提取链接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！