使用写文件的方式下载图片

一、下载图片的具体代码

import os
import shutil
import requests
from lxml import etree

class DownImage(object):
    """
    创建一个下载图片的类
    """

    def __init__(self):
        self.urls = ['http://python.jobbole.com/category/guide/page/{0}/'.format(x) for x in range(10)]
        self.headers = {
            'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36',
        }

    @property
    def create_dir(self):
        """
        定义创建一个文件夹的方法(有就删除没用就删除)
        :return:
        """
        path = os.path.join(os.path.dirname(__file__), 'jobbole')
        if os.path.exists(path):
            shutil.rmtree(path)
        else:
            os.makedirs(path)
        return path

    @property
    def get_html(self):
        """
        请求页面,返回标题及图片的url地址
        :return:
        """
        img_list = []
        for item in self.urls:
            response = requests.get(url=item, headers=self.headers)
            if response.status_code == 200:
                html = etree.HTML(response.text)
                img_urls = html.xpath('//div[@class="post floated-thumb"]')
                for img in img_urls:
                    url = img.xpath('./div[@class="post-thumb"]//img/@src')[0]
                    img_list.append(url)
        print(img_list)
        return img_list

    def main(self):
        """
        定义下载图片的(先将全部的图片存到内存中,然后一次性下载)
        :return:
        """
        path = self.create_dir

        if os.path.exists(path):
            for img_url in self.get_html:
                img_name = img_url.rsplit('/')[-1]
                response = requests.get(url=img_url, headers=self.headers)
                with open(os.path.join(path, img_name), 'wb') as fb:
                    fb.write(response.content)

if __name__ == '__main__':
    down_image = DownImage()
    down_image.main()