from bs4 import BeautifulSoup

import requests

import os

os.makedirs('./img/', exist_ok=True)

URL = "http://www.nationalgeographic.com.cn/animals/"

html = requests.get(URL).text

soup = BeautifulSoup(html, 'lxml')

img_ul = soup.find_all('ul', {"class": "img_list"})

for ul in img_ul:

    imgs = ul.find_all('img')

    for img in imgs:

        url = img['src']

        r = requests.get(url, stream=True)

        image_name = url.split('/')[-1]

        with open('./img/%s' % image_name, 'wb') as f:

            for chunk in r.iter_content(chunk_size=128):

                f.write(chunk)

        print('Saved %s' % image_name)