How to scrape the next pages in python using Beautifulsoup

问题

Suppose I am scraping a url

http://www.engineering.careers360.com/colleges/list-of-engineering-colleges-in-India?sort_filter=alpha

and it contents no of pages which contains the data which I want to scrape. So how can I scrape the data of all the next pages. I am using python 3.5.1 and Beautifulsoup. Note: I can't use scrapy and lxml as it is giving me some installation error.

回答1:

Determine the last page by extracting the page argument of the "Go to the last page" element. And loop over every page maintaining a web-scraping session via requests.Session():

import re

import requests
from bs4 import BeautifulSoup


with requests.Session() as session:
    # extract the last page
    response = session.get("http://www.engineering.careers360.com/colleges/list-of-engineering-colleges-in-India?sort_filter=alpha")    
    soup = BeautifulSoup(response.content, "html.parser")
    last_page = int(re.search("page=(\d+)", soup.select_one("li.pager-last").a["href"]).group(1))

    # loop over every page
    for page in range(last_page):
        response = session.get("http://www.engineering.careers360.com/colleges/list-of-engineering-colleges-in-India?sort_filter=alpha&page=%f" % page)
        soup = BeautifulSoup(response.content, "html.parser")

        # print the title of every search result
        for result in soup.select("li.search-result"):
            title = result.find("div", class_="title").get_text(strip=True)
            print(title)

Prints:

A C S College of Engineering, Bangalore
A1 Global Institute of Engineering and Technology, Prakasam
AAA College of Engineering and Technology, Thiruthangal
...

来源：https://stackoverflow.com/questions/36015965/how-to-scrape-the-next-pages-in-python-using-beautifulsoup