爬取地理网站的图片报错raise MissingSchema(error) requests.exceptions.MissingSchema: Invalid URL '': No schema supplied. Perhaps you meant http://?

[whiteminta3]

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_li = soup.find_all('li', {"class": "mod_w"})

for li in img_li: imgs = li.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)

[whiteminta3]

这是运行后报错的代码 Traceback (most recent call last): File "3-3-practice-download-images.py", line 16, in r = requests.get(url, stream=True) File "C:\PYTHON\lib\site-packages\requests\api.py", line 76, in get return request('get', url, params=params, **kwargs) File "C:\PYTHON\lib\site-packages\requests\api.py", line 61, in request return session.request(method=method, url=url, **kwargs) File "C:\PYTHON\lib\site-packages\requests\sessions.py", line 516, in request prep = self.prepare_request(req) File "C:\PYTHON\lib\site-packages\requests\sessions.py", line 449, in prepare_request p.prepare( File "C:\PYTHON\lib\site-packages\requests\models.py", line 314, in prepare self.prepare_url(url, params) File "C:\PYTHON\lib\site-packages\requests\models.py", line 388, in prepare_url raise MissingSchema(error) requests.exceptions.MissingSchema: Invalid URL '': No schema supplied. Perhaps you meant http://?