中国大学排名(python爬虫)

?其实在当今社会，网络上充斥着大量有用的数据，我们只需要耐心的观察，再加上一些技术手段，就可以获取到大量的有价值数据。这里的“技术手段”就是网络爬虫。今天就给大家分享一篇爬虫基础知识和入门教程：

import requests
from bs4 import BeautifulSoup
import csv
import matplotlib.pyplot as plt


def getHTMLText(url):
    try:
        r = requests.get(url, timeout=30)
        r.raise_for_status()
        r.encoding = r.apparent_encoding
        html = r.text
        return html
    except:
        print("爬取失败")
        return None


def fillUnivList(ulist, html):
    soup = BeautifulSoup(html, 'html.parser')
    table = soup.find('table', class_='rk-table')
    if table is None:
        print("未找到排名表格")
        return
    tbody = table.find('tbody')
    if tbody is None:
        print("未找到<tbody>标签")
        return
    data = tbody.find_all('tr')
    for tr in data:
        tds = tr.find_all('td')
        if len(tds) < 5:  # 跳过不完整的行
            continue
        td_2 = tds[2].text.strip() if tds[2].text else ""
        td_3 = tds[3].text.strip() if tds[3].text else ""
        ulist.append([tds[0].string.strip(), tds[1].find('a').string.strip(),
                      td_2, td_3, tds[4].string.strip()])


def printUnivList(ulist, num):
    file_name = "../第六周/大学排行.csv"
    with open(file_name, 'w', newline='', encoding='utf-8') as f:
        writer = csv.writer(f)
        writer.writerow(["排名", "大学名称", "省市", "类型", "总分"])
        for i in range(num):
            u = ulist[i]
            writer.writerow(u)
            print(f"排名：{u[0]}\t大学名称：{u[1]}\t省市：{u[2]}\t类型：{u[3]}\t总分：{u[4]}")




def main():
    ulist = []
    url = 'https://www.shanghairanking.cn/rankings/bcur/202311.html'
    html = getHTMLText(url)
    if html is not None:
        fillUnivList(ulist, html)
        printUnivList(ulist, 30)


main()

def printUnivList(ulist, num):
    file_name = "../第六周/大学排行.csv"
    with open(file_name, 'w', newline='', encoding='utf-8') as f:
        writer = csv.writer(f)
        writer.writerow(["排名", "大学名称", "省市", "类型", "总分"])
        for i in range(num):
            u = ulist[i]
            writer.writerow(u)
            print(f"排名：{u[0]}\t大学名称：{u[1]}\t省市：{u[2]}\t类型：{u[3]}\t总分：{u[4]}")

?在进行爬虫编码的过程中要格外的注意网址的的可读性,有的网址可能是以前的网站,根本搜不出来.希望大家注意

这是我们python学习的实践作业,希望可以帮助到大家