如何使用 BeautifulSoup 从网站获取 href 链接

Question

我正在尝试获取下面给定网站中的所有文章链接。然而，尽管我指定了类 ID 及其路径，但我的代码根本不打印任何内容。下面是我的代码。import requestsfrom lxml import htmlfrom bs4 import BeautifulSoupfrom urllib.request import urlopenhtml = urlopen("https://uynaa.wordpress.com/category/%d0%be%d1%80%d1%87%d1%83%d1%83%d0%bb%d0%b3%d1%8b%d0%bd-%d0%bd%d0%b8%d0%b9%d1%82%d0%bb%d1%8d%d0%bb/").read()soup = BeautifulSoup(html, "lxml")productDivs = soup.findAll('div', attrs={'class' : 'post type-post status-publish format-standard hentry category-56456384'})for div in productDivs:    print(div.find('h2')[a]['href'])如何获取所有链接？

Answer 1

这些链接是通过 JavaScript 从外部 URL 动态加载的。您可以使用此示例来打印所有链接：

import json

import requests 

from bs4 import BeautifulSoup

data = {'action': 'infinite_scroll', 'page': 1}

api_url = 'https://uynaa.wordpress.com/?infinity=scrolling'

page = 1

while True:

    data['page'] = page

    data = requests.post(api_url, data=data).json()

    # uncomment next line to print all data:

    # print(json.dumps(data, indent=4))

    for p in data['postflair']:

        print(p)

    if data['lastbatch']:

        break

    page += 1

印刷：

https://uynaa.wordpress.com/2014/01/02/2013-in-review/

https://uynaa.wordpress.com/2013/10/07/%d0%b0%d1%84%d0%b3%d0%b0%d0%bd%d0%b8%d1%81%d1%82%d0%b0%d0%bd-%d0%b0%d0%bd%d1%85%d0%b4%d0%b0%d0%b3%d1%87-%d1%88%d0%b0%d0%bb%d1%82%d0%b3%d0%b0%d0%b0%d0%bd/

https://uynaa.wordpress.com/2013/10/07/%d0%b5-%d0%ba%d0%b0%d1%81%d0%bf%d0%b5%d1%80%d1%81%d0%ba%d0%b8%d0%b9-%d0%b1%d0%b8-%d0%b4%d0%b0%d1%80%d0%b0%d0%bd%d0%b3%d1%83%d0%b9%d0%bb%d0%b0%d0%bb-%d1%82%d0%be%d0%b3%d1%82%d0%be%d0%be-%d0%b3%d1%8d/

https://uynaa.wordpress.com/2013/10/07/%d1%88%d0%b0%d0%bd%d1%85%d0%b0%d0%b9-%d0%bd%d0%be%d0%b3%d0%be%d0%be%d0%bd/

https://uynaa.wordpress.com/2013/10/07/%d1%8d%d0%bd%d1%8d-%d0%b3%d0%b0%d0%b7%d0%b0%d1%80-%d0%bc%d0%b0%d0%bd%d0%b0%d0%b9%d1%85-%d0%b1%d0%b0%d0%b9%d1%81%d0%b0%d0%bd-%d1%8e%d0%bc/

https://uynaa.wordpress.com/2013/10/07/500-%d0%b6%d0%b8%d0%bb-%d0%b0%d1%80%d1%87%d0%bb%d1%83%d1%83%d0%bb%d0%b0%d0%b0%d0%b3%d2%af%d0%b9-%d0%b4%d1%8d%d0%bb%d1%85%d0%b8%d0%b9%d0%bd-%d1%86%d0%be%d1%80%d1%8b%d0%bd-%d0%b3%d0%b0%d0%bd%d1%86/

https://uynaa.wordpress.com/2013/02/01/%d1%83%d0%bb%d0%b7-%d0%bd%d1%83%d1%82%d0%b3%d0%b8%d0%b9%d0%bd-%d0%bf%d0%b8%d1%84%d0%b0%d0%b3%d0%be%d1%80/

https://uynaa.wordpress.com/2013/01/21/%d1%82%d0%b5%d0%bb%d0%b5%d0%b2%d0%b8%d0%b7%d0%b8%d0%b9%d0%bd-%d1%82%d2%af%d2%af%d1%85%d1%8d%d0%bd-%d0%b4%d1%8d%d1%85-%d1%85%d0%b0%d0%bc%d0%b3%d0%b8%d0%b9%d0%bd-%d0%b3%d0%b0%d0%b6%d0%b8%d0%b3-%d1%88/

https://uynaa.wordpress.com/2013/01/18/%d0%b0%d0%bf%d0%be%d1%84%d0%b8%d1%81-%d0%be%d0%be%d1%81-%d2%af%d2%af%d0%b4%d1%8d%d0%bd-%d3%a9%d1%80%d0%bd%d3%a9%d1%85-%d0%b6%d2%af%d0%b6%d0%b8%d0%b3/

https://uynaa.wordpress.com/2013/01/17/%d0%b0%d1%80%d0%b8%d1%83%d0%bd%d1%82%d0%bd%d1%8b-%d0%bd%d1%83%d1%82%d0%b0%d0%b3-%d0%b8%d0%b9%d0%b3-%d1%8d%d0%b7%d1%8d%d0%b3%d0%bd%d1%8d%d1%85-%d1%85%d0%b0%d0%bd/

https://uynaa.wordpress.com/2013/01/15/%d1%81%d0%b0%d1%83%d0%b4%d1%8b%d0%bd-%d1%82%d0%b0%d0%b3%d0%bd%d1%83%d1%83%d0%bb%d1%87%d0%b8%d0%b4-%d0%b0%d1%81%d0%b0%d0%b4%d1%8b%d0%b3-%d0%be%d0%bb%d0%b6%d1%8d%d1%8d/

https://uynaa.wordpress.com/2013/01/15/%d0%bc%d0%b0%d0%bb%d0%b8%d0%b3%d1%8d%d1%8d%d1%81-%d1%81%d0%be%d0%bc%d0%b0%d0%bb%d0%b8-%d1%85%d2%af%d1%80%d1%82%d1%8d%d0%bb/

https://uynaa.wordpress.com/2013/01/10/%d1%85%d0%be%d1%80%d0%b2%d0%be%d0%be-%d0%b5%d1%80%d1%82%d3%a9%d0%bd%d1%86-%d1%85%d0%b0%d0%bb%d0%b0%d0%b0%d1%81%d0%b0%d0%bd%d0%b4-%d0%b1%d0%b0%d0%b3%d1%82%d0%b0%d0%bd%d0%b0/

https://uynaa.wordpress.com/2013/01/10/%d1%82%d0%b0%d0%bd%d0%b3%d0%b0%d1%80%d0%b0%d0%b3-%d3%a9%d1%80%d0%b3%d3%a9%d1%85-%d1%91%d1%81%d0%bb%d0%be%d0%bb-%d1%85%d2%af%d0%bb%d1%8d%d1%8d%d0%b6-%d0%b1%d0%b0%d0%b9%d0%b3-%d1%8d%d1%8d/

https://uynaa.wordpress.com/2013/01/09/%d0%b1%d0%be%d0%bb%d0%bb%d0%b8%d0%b2%d1%83%d0%b4%d1%8b%d0%bd-%d0%ba%d0%b8%d0%bd%d0%be%d0%bd%d0%be%d0%be%d1%81-%d1%87-%d0%b0%d0%b9%d0%bc%d0%b0%d0%b0%d1%80/

https://uynaa.wordpress.com/2013/01/08/%d0%bf%d0%b5%d0%bd%d1%82%d0%b0%d0%b3%d0%be%d0%bd-%d0%b1%d0%be%d0%bb%d0%be%d0%bd-%d1%82%d1%82%d0%b3-%d1%8b%d0%b3-%d1%83%d0%b4%d0%b8%d1%80%d0%b4%d0%b0%d1%85-%d0%bc%d0%b0%d0%b3%d0%b0%d0%b4%d0%bb%d0%b0/

https://uynaa.wordpress.com/2013/01/07/%d0%b7%d0%b8%d0%b0%d0%b4-%d1%82%d0%b0%d0%ba%d0%b8%d0%b5%d0%b4%d0%b4%d0%b8%d0%bd/

...and so on.

编辑：要仅过滤指定类别的链接，您可以使用以下脚本：

import json

import requests 

from bs4 import BeautifulSoup

data = {'action': 'infinite_scroll', 'page': 1}

api_url = 'https://uynaa.wordpress.com/?infinity=scrolling'

all_links = []

page = 1

while True:

    data['page'] = page

    data = requests.post(api_url, data=data).json()

    # uncomment next line to print all data:

    # print(json.dumps(data, indent=4))

    soup = BeautifulSoup(data['html'], 'html.parser')

    for p in soup.select('.post'):

        if any('%d0%be%d1%80%d1%87%d1%83%d1%83%d0%bb%d0%b3%d1%8b%d0%bd-%d0%bd%d0%b8%d0%b9%d1%82%d0%bb%d1%8d%d0%bb' in cat['href'] for cat in p.select('[rel="category tag"]')):

            if p.h2.a['href'] not in all_links:

                print(p.h2.a['href'])

                all_links.append(p.h2.a['href'])  

    if data['lastbatch']:

        break

    page += 1

print(len(all_links))

打印 135 个链接：

...

https://uynaa.wordpress.com/2011/05/13/%e2%80%9c%d1%83%d1%85%d0%b0%d0%b0%d0%bd-%d0%bc%d1%83%d1%83%d1%82%d0%bd%d1%83%d1%83%d0%b4%d1%8b%d0%bd-%d2%af%d0%b5%e2%80%9d/

https://uynaa.wordpress.com/2011/05/04/%d2%af%d1%85%d0%bb%d0%b8%d0%b9%d0%bd-%d1%82%d0%be%d0%b3%d0%bb%d0%be%d0%be%d0%bc/

https://uynaa.wordpress.com/2011/05/04/%d0%be%d1%81%d0%b0%d0%bc%d0%b0-%d0%b1%d0%b8%d0%bd-%d0%bb%d0%b0%d0%b4%d0%b5%d0%bd%d0%b8%d0%b9%d0%b3-%d1%8f%d0%b0%d0%b6-%d0%b8%d0%bb%d1%80%d2%af%d2%af%d0%bb%d1%81%d1%8d%d0%bd-%d0%b1%d1%8d/

135

Answer 2

不确定为什么你的代码不起作用。对我来说，我使用下面的代码首先获取所有链接。

list_href = []

a_tags = soup.find_all('a')

for tag in a_tags:

    list_href.append(tag.get('href'))

文章的链接位于 list_href[5:26] 中。