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://? about wxbot

[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://?