pip升级失败 -- 解决WARNING: You are using pip version 20.0.2； however, version 20.1 is available 的问题

使用固定命令升级的时候，由于默认使用的是国外的服务器，所以经常出现超时失败的情况，诸如：

You are using pip version 20.0.2, however version 21.0 is available.
You should consider upgrading via the ‘python -m pip install --upgrade pip’ command.

换到国内镜像就好了,使用

python -m pip install --upgrade pip -i https://pypi.douban.com/simple

升级成功

值得注意的是，换了高版本的 python（3.9及以上）后，还需要别的操作
详情看这篇文章：Python使用pip安装模块时提示：E:\installsoft\python39\python.exe: No module named pip

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pip升级失败 -- 解决WARNING: You are using pip version 20.0.2； however, version 20.1 is available 的问题

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