pip安装第三方库报错SSL: CERTIFICATE_VERIFY_FAILED

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安装命令：

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pip install --upgrade requests

报错内容：

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Could not fetch URL https://pypi.org/simple/baostock/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/baostock/ (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate in certificate chain (_ssl.c:1045)'))) - skipping

错误原因：
当前python版本是3.7，高版本python需要验证ssl，需要添加--trusted-host来跳过验证

解决办法：

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pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org requests

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