如何使用 Beautifulsoup 在 python 中抓取下一页

Question

假设我正在抓取一个 url

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

它不包含包含我要抓取的数据的页面。那么我怎样才能抓取所有下一页的数据。 我正在使用 python 3.5.1 和 Beautifulsoup。 注意：我不能使用 scrapy 和 lxml，因为它会给我一些安装错误。

Answer 1

通过提取“转到最后一页”元素的page 参数来确定最后一页。并循环通过requests.Session() 维护网络抓取会话的每个页面：

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)

打印：

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