PIP报错
每次使用pip 看到这个升级的提示就很烦，按照提示操作报错，解决办法如下：
建议使用国内的源来升级：
python -m pip instatll --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn
错误提示：
You are using pip version 10.0.1, however version 20.0.2 is available.
You should consider upgrading via the ‘python -m pip install --upgrade pip’ command.
2.按照提示，删除提示已安装的包
3.重新安装：python -m pip instatll --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple --trusted-host pypi.tuna.tsinghua.edu.cn