爬图片之线程池

from concurrent.futures import ThreadPoolExecutor
import requests
from lxml import etree


class PicApp:
    @classmethod
    def download_pic(cls, string):
        resp = requests.get(string)
        html = etree.HTML(resp.text)
        table = html.xpath("/html/body/div[5]/ul")[0]
        alist = table.xpath("./li/a/@href")
        for u in alist:
            resp = requests.get(u)
            html = etree.HTML(resp.text)
            a = html.xpath("/html/body/div[3]/div[2]/a")[0]
            src = a.xpath("./@href")[0]
            # 下载图片
            img = requests.get(src)
            name = src.split("/")[-1]
            with open("img/" + name, mode="wb") as f:
                print("图片下载中------------------")
                f.write(img.content)
                f.close()


if __name__ == '__main__':
    app = PicApp
    with ThreadPoolExecutor(50) as t:
        for i in range(25, 44):
            url = f"https://www.3gbizhi.com/wallDM/index_{i}.html"
            t.submit(app.download_pic, url)
    print("下载完毕！")