pip安装包遇到ssl错误问题

在使用pip install selenium时遇到错误

Could not install packages due to an EnvironmentError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/57/bc/17164fd471ccdf0df3a992c710c0c3c47743462ff41ab72a02c6ede96e90/selenium-3.12.0-py2.py3-none-any.whl (Caused by SSLError(SSLError("bad handshake: Error([('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')],)",),))

google好好久都找不到好的解决办法,国外源网络慢的原因
最后解决命令是

pip install selenium -i https://pypi.douban.com/simple/ --trusted-host pypi.douban.com

可这也不是长久之计啊,配全局?也觉得不是好办法

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