Python LocationValueError: No host specified

问题:

My python can't connect to the Internet since last time my Windows updated.

When I pip something , error goes like

if host.startswith('['):    AttributeError: 'NoneType' object has no attribute 'startswith' 

It is just that I can't pip anything on the Internet, anything.

And then I thought maybe something went wrong with my system, so I tried checking if "requests" worked correctly. But hosts error goes like

  r = requests.get('http://www.baidu.com')   Traceback (most recent call last):   File "<stdin>", line 1, in <module>   File "D:\Program Files (x86)\Anaconda3\lib\site-packages\requests\api.py",      line 70, in get     return request('get', url, params=params, **kwargs)   File "D:\Program Files (x86)\Anaconda3\lib\site-packages\requests\api.py",      line 56, in request     return session.request(method=method, url=url, **kwargs)   File "D:\Program Files (x86)\Anaconda3\lib\site-     packages\requests\sessions.py", line 488, in request     resp = self.send(prep, **send_kwargs)   File "D:\Program Files (x86)\Anaconda3\lib\site-     packages\requests\sessions.py", line 609, in send     r = adapter.send(request, **kwargs)   File "D:\Program Files (x86)\Anaconda3\lib\site-     packages\requests\adapters.py", line 390, in send     conn = self.get_connection(request.url, proxies)   File "D:\Program Files (x86)\Anaconda3\lib\site-     packages\requests\adapters.py", line 291, in get_connection     conn = proxy_manager.connection_from_url(url)   File "D:\Program Files (x86)\Anaconda3\lib\site-     packages\requests\packages\urllib3\poolmanager.py", line 222, in      connection_from_url     return self.connection_from_host(u.host, port=u.port, scheme=u.scheme)   File "D:\Program Files (x86)\Anaconda3\lib\site-     packages\requests\packages\urllib3\poolmanager.py", line 331, in      connection_from_host     self.proxy.host, self.proxy.port, self.proxy.scheme)   File "D:\Program Files (x86)\Anaconda3\lib\site-     packages\requests\packages\urllib3\poolmanager.py", line 167, in      connection_from_host     raise LocationValueError("No host specified.")     requests.packages.urllib3.exceptions.LocationValueError: No host    specified. 

I've used "requests" for hundreds of times before my computer went wrong. And I 've never seen errors like this before. By the way, my Internet is working perfectly, or else I can't ask a question from here.

I don't understand what is wrong with my computer or host file, I'd appreciate it if someone can help me out.

回答1:

error location：

Lib\urllib\request.py： proxyEnable = winreg.QueryValueEx(internetSettings, 'ProxyEnable')[0] 

if proxyEnable is string , you'll see the error. The reason is in your registry, ProxyEnable is set as REG_SZ but not REG_DWORD, so change it and all is ok. open the registry:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings \ ProxyEnable

（you can also directly search ProxyEnable）

delete ProxyEnable create a new ProxyEnable form (REG_SZ 0) to (REG_DWORD 0x00000000(0))

see follow pictures,my pc language is chinese, but the location for ProxyEnable is the same.

create a new ProxyEnable

right value for ProxyEnable

文章来源: Python LocationValueError: No host specified