You are using pip version 18.1, however version 20.0.2 is available. You should consider upgrading v

记录一下。
关于You are using pip version 18.1, however version 20.0.2 is available.
You should consider upgrading via the ‘python -m pip install --upgrade pip’ command.
在网上找了很久，终于找到能用的了。
python -m pip install --upgrade pip
听说是国外的要翻墙。所以一直失败。

然后国内的用这个，不能翻墙的看过来。
python -m pip install --upgrade pip -i https://pypi.douban.com/simple