爬虫实例

# 爬取糗图上的图片

import re
import urllib.request
import os


def handler_request(url, page):
    url = url + str(page) + "/"
    headers = {
        "user-agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) Apple                      WebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36"
    }
    request = urllib.request.Request(url, headers=headers)
    return request


def download_image(page, html):
    headers = {
        "user-agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) Apple                                  WebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36"
    }
    pattern = re.compile(r‘<img src="(.*?)" alt=".*?" />‘)
    src_list = pattern.findall(html)

    dirs = os.path.join(os.getcwd(), "糗图")
    if not os.path.exists(dirs):
        os.makedirs(dirs)
    for i, src in enumerate(src_list):
        src = "https:" + src
        # print(src)
        file_name = os.path.join(dirs, "第" + str(page) + "页" + str(i) + ".jpg")
        print("图片%s开始下载..." % (str(page) + "页" + str(i) + ".jpg"))
        try:
            request = urllib.request.Request(src, headers=headers)
            image = urllib.request.urlopen(request).read()
        except Exception as e:
            print("图片%s下载出错了" % (str(page) + "页" + str(i) + ".jpg"))
            continue
        print("图片%s已经下载完毕" % (str(page) + "页" + str(i) + ".jpg"))
        with open(file_name, "wb") as f:
            f.write(image)


if __name__ == ‘__main__‘:

    url = "https://www.qiushibaike.com/pic/page/"
    start_page = int(input("请输入你想要查询的起始页："))
    end_page = int(input("请输入你想要查询的结束页："))
    for page in range(start_page, end_page + 1):
        print("第%s页开始下载..." % page)
        request = handler_request(url, page)
        content = urllib.request.urlopen(request).read().decode()
        download_image(page, content)
        print("第%s页已经下载完毕" % page)
        print()
        print()
        # print(content)