我以前见过此错误，它通常是由公司代理背后引起的，或者是您被伪造的.
假设它是代理，您需要确定您的https代理是什么并将其添加到pip命令中，如下所示:

I've seen this error before, it is usually caused by being behind a corporate proxy, or you have been pwned.
Assuming its the proxy, you need to figure out what your https proxy is and add it to the pip command like so:

pip install requests --proxy=https://my_proxy.com:xxx

其中xxx是您的代理服务器的端口

where xxx is the port of your proxy