Python3 --- 下载图片代码：

#！ /usr/bin/python
# -*- coding： UTF-8 -*-

from bs4 import BeautifulSoup
from urllib.request import urlretrieve
import requests
import time
import os


class Download(object):
    def __init__(self):
        self.headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
        }
    '''
    获取下载链接地址：
    '''
    def list_url(self,num):
        list_url = []
        for i in range(1,num):
            if i == 1:
                url = 'http://www.shuaia.net/meinv/'
            else:
                url = 'http://www.shuaia.net/meinv/index_%d.html' % num

            req = requests.get(url=url,headers=self.headers)
            req.encoding = 'utf-8'
            html = req.text
            bf = BeautifulSoup(html,'lxml')
            targets_url = bf.find_all(class_ = "item-img")
            for each in targets_url:
                list_url.append(each.img.get('alt') + '=' + each.get('href'))
            time.sleep(3)
        print("链接地址采集完成")
        #print(list_url)
        return list_url

    '''
    下载图片
    '''
    def download_img(self,list_url):
        for each_img in list_url:
            img_info = each_img.split('=')
            targets_url = img_info[1]
            filename = img_info[0] + '.jpg'
            print('下载：' + filename)
            img_req = requests.get(url=targets_url,headers = self.headers)
            img_req.encoding = 'utf-8'
            img_html = img_req.text
            img_bf_1 = BeautifulSoup(img_html,'lxml')
            img_url = img_bf_1.find_all('div',class_ = 'wr-single-content')
            img_bf_2 = BeautifulSoup(str(img_url), 'lxml')
            img_url_all = img_bf_2.img.get('src')
            urlretrieve(url=img_url_all, filename='D:\\PycharmProjects1\\images\\' + filename)
            time.sleep(10)

if __name__ == '__main__':
    dow = Download()
    list_url = dow.list_url(2)
    dow.download_img(list_url)