正确设置 pip，避免There was a problem confirming the ssl certificate问题

windows 环境下，python 安装好后，最好将 pip 源换成国内的，同时添加一下信任主机。避免形如：
Could not fetch URL https://pypi.tuna.tsinghua.edu.cn/simple/requests/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host=‘pypi.tuna.tsinghua.edu.cn’, port=44
3): Max retries exceeded with url: /simple/requests/ (Caused by SSLError(SSLCertVerificationError(1, ‘[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local iss
uer certificate (_ssl.c:1123)’))) - skipping
ERROR: Could not find a version that satisfies the requirement requests (from versions: none)
ERROR: No matching distribution found for requests
的错误出现。

首先执行

pip config set global.extra-index-url http://mirrors.aliyun.com/pypi/simple

此时可以看到 pip 自动生成了一个文件，提示：Writing to C:\Users\xxxxxx\AppData\Roaming\pip\pip.ini
打开该文件，直接将下列内容覆盖进去：

[global]
index-url = http://mirrors.aliyun.com/pypi/simple
extra-index-url = http://pypi.douban.com/simplehttps://pypi.tuna.tsinghua.edu.cn/simplehttp://pypi.mirrors.ustc.edu.cn/simplehttp://pypi.hustunique.com[install]
trusted-host = mirrors.aliyun.compypi.douban.compypi.tuna.tsinghua.edu.cnpypi.mirrors.ustc.edu.cnmirrors.ustc.edu.cnmirrors.bfsu.edu.cnpypi.hustunique.com

保存，完成

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正确设置 pip，避免There was a problem confirming the ssl certificate问题

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