Python 爬虫 小案例 之 快手下载视频

前言

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知识点:

动态数据抓包
requests发送请求

开发环境:

python 3.8               运行代码
pycharm 2022.3           辅助敲代码
requests                 pip install requests

案例思路

一. 思路(需求)分析

1. 找到真实的数据来源
    https://www.kuaishou.com/graphql

二. 代码实现

1. 发送请求
2. 获取数据
3. 解析数据
4. 保存数据

代码展示

导入模块

import requests     # 发送请求第三方库 额外安装
import os

if not os.path.exists('video'):
    os.mkdir('video')

模拟浏览器

headers = {
    'Cookie': 'kpf=PC_WEB; clientid=3; did=web_279f6644708643f6590253c172444317; userId=3293066791; kuaishou.server.web_st=ChZrdWFpc2hvdS5zZXJ2ZXIud2ViLnN0EqABq79HDdbVzT-1D0e7qqksHMYNpTLBY2Am2JRy4o9P5cKoGvQmhDaYmSyUEY7DtdpZy1zwi8UciRmwS9YR1QqkBEo450JX-ICZc6IqLgnKSLZSNHu-DZNr5_vNGt4VqfmGI9aDMaldlAwjOE7poXhWnFQ-rygoTnWX2ns_MQ9WMhLQ5ynmVahud0Rgltew4UzOVG5C7E1x4mRYhcKodRkHnhoSTdCMiCqspRXB3AhuFugv61B-IiCqOqQ5DfDB1wZLV7Ai7aTCi9-2surn8lQUoOqKBslLXSgFMAE; kuaishou.server.web_ph=7162254888b4f9d8a92a1d2c71c253720a5e; kpn=KUAISHOU_VISION',
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36'
}

请求链接

url = 'https://www.kuaishou.com/graphql'

pcursor = ""
while True:
    json = {
        "operationName":"visionProfilePhotoList",
        "variables":{
            "userId":"3x4rustdcf45vti",
            "pcursor":pcursor,
            "page":"profile"
        },
        "query":"fragment photoContent on PhotoEntity {\n  __typename\n  id\n  duration\n  caption\n  originCaption\n  likeCount\n  viewCount\n  commentCount\n  realLikeCount\n  coverUrl\n  photoUrl\n  photoH265Url\n  manifest\n  manifestH265\n  videoResource\n  coverUrls {\n    url\n    __typename\n  }\n  timestamp\n  expTag\n  animatedCoverUrl\n  distance\n  videoRatio\n  liked\n  stereoType\n  profileUserTopPhoto\n  musicBlocked\n}\n\nfragment recoPhotoFragment on recoPhotoEntity {\n  __typename\n  id\n  duration\n  caption\n  originCaption\n  likeCount\n  viewCount\n  commentCount\n  realLikeCount\n  coverUrl\n  photoUrl\n  photoH265Url\n  manifest\n  manifestH265\n  videoResource\n  coverUrls {\n    url\n    __typename\n  }\n  timestamp\n  expTag\n  animatedCoverUrl\n  distance\n  videoRatio\n  liked\n  stereoType\n  profileUserTopPhoto\n  musicBlocked\n}\n\nfragment feedContent on Feed {\n  type\n  author {\n    id\n    name\n    headerUrl\n    following\n    headerUrls {\n      url\n      __typename\n    }\n    __typename\n  }\n  photo {\n    ...photoContent\n    ...recoPhotoFragment\n    __typename\n  }\n  canAddComment\n  llsid\n  status\n  currentPcursor\n  tags {\n    type\n    name\n    __typename\n  }\n  __typename\n}\n\nquery visionProfilePhotoList($pcursor: String, $userId: String, $page: String, $webPageArea: String) {\n  visionProfilePhotoList(pcursor: $pcursor, userId: $userId, page: $page, webPageArea: $webPageArea) {\n    result\n    llsid\n    webPageArea\n    feeds {\n      ...feedContent\n      __typename\n    }\n    hostName\n    pcursor\n    __typename\n  }\n}\n"
    }

1. 发送请求

    response = requests.post(url=url, json=json, headers=headers)

2. 获取数据

    json_data = response.json()

3. 解析数据

    feeds = json_data['data']['visionProfilePhotoList']['feeds']
    pcursor = json_data['data']['visionProfilePhotoList']['pcursor']
    for feed in feeds:
        photoUrl = feed['photo']['photoUrl']    # 视频链接
        caption = feed['photo']['caption']      # 视频标题
        print(caption, photoUrl)
        # video_data = requests.get(photoUrl).content
        # with open(f'video/{caption}.mp4', mode='wb') as f:
        #     f.write(video_data)
    if pcursor == "no_more":
        break

尾语

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