使用BeautifulSoup、requests和you_get爬虫下载B站视频

前言

BeautifulSoup 是一个可以从HTML或XML文件中提取数据并解析的Python库， Requests 是一常用的可以获取和发送http的请求库， you_get 则是方便的下载各大网站的视频的命令行工具。整体流程上是，先用 Requests 请求获得网站源代码，再用 BeautifulSoup 解析网站并筛选出自己要的信息（如视频的url），最后用 you_get 下载。

例子

以下代码实现的是下载B站电影。

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sun Mar 15 12:06:21 2020

@author: weiquan fan
"""

from bs4 import BeautifulSoup as bs
import requests,re,os


def download(url, filename):
    path_root = './Videos'
    os.system('you-get -o {} -O {} {}'.format(path_root, filename, url))

url_base = 'https://www.bilibili.com/movie/?spm_id_from=333.851.b_62696c695f7265706f72745f6d6f766965.2'

response = requests.get(url_base)
page = response.text
soup = bs(page, 'html.parser')
vids = soup.findAll('li',attrs={'class':re.compile('video-item-biref.*?')})# bilibili

video_urls = []
counter=1

if(vids):
    for v in vids:
        #v_link = v.find('a')['href']
        #v_name = v.find('img')['alt']
        print(v)
        v_link = v.find('a')['href']
        v_name = v.find('img')['alt']

        video_urls.append([v_link, v_name])
        print(v_link,v_name)

        try:
            download(v_link, v_name)

        except Exception:
            print('can\'t download '+v_name+' in '+v_link)
            counter -= 1

        counter += 1
        if(counter>15):
            break