You are using pip version 19.0.3, however version 19.3.1 is available. You should consider upgrading

You are using pip version 19.0.3, however version 19.3.1 is available.
You should consider upgrading via the ‘python -m pip install --upgrade pip’ command.的解决
我要pip安装新的包，总是提示上述错误

然后就按照提示更新
但是依然报错，于是我就这一样了

然后就成功更新了，但是又遇到了个问题

后面这个求解答