使用 BeautifulSoup 移动到下一页进行抓取

Question

我需要从网站上抓取内容（只是标题）。我为一页做了这件事，但我需要为网站上的所有页面做这件事。目前，我是这样做的：

import bs4, requests
import pandas as pd
import re

headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'}
    
    
r = requests.get(website, headers=headers)
soup = bs4.BeautifulSoup(r.text, 'html')


title=soup.find_all('h2')

我知道，当我移至下一页时，url 会发生如下变化：

website/page/2/
website/page/3/
... 
website/page/49/
...

我尝试使用 next_page_url = base_url + next_page_partial 构建递归函数，但它没有移动到下一页。

if soup.find("span", text=re.compile("Next")):
    page = "https://catania.liveuniversity.it/notizie-catania-cronaca/cronacacatenesesicilina/page/".format(page_num)
    page_num +=10 # I should scrape all the pages so maybe this number should be changed as I do not know at the beginning how many pages there are for that section
    print(page_num)
else:
    break

我关注了这个问题（和答案）：

如果您需要更多信息，请告诉我。非常感谢

更新代码：

import bs4, requests
import pandas as pd
import re

headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'}

page_num=1
website="https://catania.liveuniversity.it/notizie-catania-cronaca/cronacacatenesesicilina"

while True:
  r = requests.get(website, headers=headers)
  soup = bs4.BeautifulSoup(r.text, 'html')


  title=soup.find_all('h2')

  if soup.find("span", text=re.compile("Next")):
      page = f"https://catania.liveuniversity.it/notizie-catania-cronaca/cronacacatenesesicilina/page/{page_num}".format(page_num)
      page_num +=10
  else:
      break

Answer 1

如果您使用 f"url/{page_num}"，则删除 format(page_num)。

您可以使用下面的任何内容：

page = f"https://catania.liveuniversity.it/notizie-catania-cronaca/cronacacatenesesicilina/page/{page_num}"

或

page = "https://catania.liveuniversity.it/notizie-catania-cronaca/cronacacatenesesicilina/page/{}".format(page_num)

祝你好运！

最终答案是这样的：

import bs4, requests
import pandas as pd
import re

headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'}

page_num=1
website="https://catania.liveuniversity.it/notizie-catania-cronaca/cronacacatenesesicilina"

while True:
  r = requests.get(website, headers=headers)
  soup = bs4.BeautifulSoup(r.text, 'html')


  title=soup.find_all('h2')

  if soup.find("span", text=re.compile("Next")):
      website = f"https://catania.liveuniversity.it/notizie-catania-cronaca/cronacacatenesesicilina/page/{page_num}"
      page_num +=1
  else:
      break

使用 BeautifulSoup 移动到下一页进行抓取

Moving to the next page using BeautifulSoup for scraping

python

beautifulsoup

web-crawler

web-scraping