Check network connectivity :

Make sure your computer is connected to the Internet. You can try accessing the same URL in your browser to confirm whether it can be accessed normally.

Check the URL:

Make sure the URL you are requesting is formatted correctly, with no typos or extra spaces. Try using the http :// or https:// prefix.

DNS Configuration:

Sometimes there may be problems with the DNS configuration, you can try changing the DNS server. For example, you can use Google's public DNS (8.8.8.8 and 8.8.4.4):
On Windows , you can change the DNS manually in the network settings.
On macOS, you can change it in System Preferences.
On Linux, you can edit the /etc/resolv.conf file.

Proxy settings:

If you are using a proxy server, make sure the proxy settings are correct and that the proxy server is working properly.

Firewall and Security Software:

Check if a firewall or security software is blocking Python from accessing the network. You can try temporarily disabling the firewall or security software to see if the problem is solved.

Using IP Address:

Try using the target website's IP address instead of the domain name. You can use command-line tools such as ping or nslookup to find the IP address that corresponds to a domain name.

Restart the network device:

Sometimes restarting your router or modem can resolve network issues.

Python environment issues:

Make sure Python and related libraries (such as requests ) are the latest version. You can update via pip install --upgrade requests.

Code example:

If you are using the requests library, you can refer to the following sample code:
import requests

try:
response = requests.get(‘http://example.com’)
print(response.text)
except requests.exceptions.RequestException as e:
print(f"请求失败: {e}")

If the above methods do not solve the problem, try running the code in a different network environment or get more error information for further troubleshooting.

This blog post is an original article and may not be reproduced without the blogger's consent. The blog address of this article is: https://cplusplus.blog.csdn.net/article/details/140888050