python - 如何使用 Beautiful soup 从页面中提取链接

Question

我有一个HTML Page具有多个 div，例如:

<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 post-info-wrap 类获取所有 div 的值，我是 BeautifulSoup 的新手

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/

• 等等...

我已经尝试过:

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']

这段代码似乎不起作用。我是美丽汤的新手。如何提取链接？

Answer 1

link = i.find('a',href=True)始终不返回 anchor 标记(a)，可能返回NoneType，所以需要验证链接是否为None，继续for循环，否则获取链接href值。

按网址抓取链接:

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 抓取链接:

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'])

操作:

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

安装 Chrome 浏览器的网络驱动程序:

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

Selenium 教程

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

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