python协程gevent案例 爬取斗鱼图片过程解析

{
        "rid": 1282190,
        "rn": "大家要开心啊~",
        "uid": 77538371,
        "nn": "鲸鱼欧尼",
        "cid1": 8,
        "cid2": 201,
        "cid3": 581,
        "iv": 1,
        "av": "avatar_v3/201908/d62c503c603945098f2c22d0d95c3b2e",
        "ol": 610574,
        "url": "/1282190",
        "c2url": "/directory/game/yz",
        "c2name": "颜值",
        "icdata": {
          "217": {
            "url": "https://sta-op.douyucdn.cn/dy-listicon/king-web.png-v3.png",
            "w": 0,
            "h": 0
          }
        },
        "dot": 2103,
        "subrt": 0,
        "topid": 0,
        "bid": 0,
        "gldid": 0,
        "rs1": "https://rpic.douyucdn.cn/live-cover/appCovers/2019/08/01/1282190_20190801002745_big.jpg/dy1",
        "rs16": "https://rpic.douyucdn.cn/live-cover/appCovers/2019/08/01/1282190_20190801002745_small.jpg/dy1",
        "utag": [
          {
            "name": "呆萌鲸鱼",
            "id": 111405
          },
          {
            "name": "美美美",
            "id": 41
          },
          {
            "name": "萌萌哒",
            "id": 520
          },
          {
            "name": "刀神老婆",
            "id": 132367
          }
        ],
        "rpos": 0,
        "rgrpt": 1,
        "rkic": "",
        "rt": 2103,
        "ot": 0,
        "clis": 1,
        "chanid": 0,
        "icv1": [
          [
            {
              "id": 217,
              "url": "https://sta-op.douyucdn.cn/dy-listicon/web-king-1-10-v3.png",
              "score": 994,
              "w": 0,
              "h": 0
            }
          ],
          [
            
          ],
          [
            
          ],
          [
            
          ]
        ],
        "ioa": 0,
        "od": ""
      }

import gevent
import json
from urllib import request
from gevent import monkey
# 使用gevent打补丁，耗时操作自动替换成gevent提供的模块
monkey.patch_all()
# 图片存放的目录
ROOT = "./images/"
# 设置请求头，防止被反爬虫的第一步
header = {
  "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36 "
}


def download(img_src):
  # 把每个链接最后的/dy1去掉
  img_src: str = img_src.replace("/dy1", "")
  # 提取图片名
  file_name: str = img_src.split("/")[-1]
  response = request.urlopen(request.Request(img_src, headers=header))
  # 保存到本地
  with open(ROOT + file_name, "wb") as f:
    f.write(response.read())
  print(file_name, "下载完成！")
if __name__ == '__main__':

  req = request.Request("https://www.douyu.com/gapi/rknc/directory/yzRec/1", headers=header)
  # 把json数据转换成python中的字典
  json_obj = json.loads(request.urlopen(req).read().decode("utf-8"))
  tasks = []
  for src in json_obj["data"]["rl"]:
    tasks.append(gevent.spawn(download, src["rs16"]))
  # 开始下载图片
  gevent.joinall(tasks)